<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Archiving and Interchange DTD v1.0 20120330//EN" "JATS-archivearticle1.dtd">
<article xmlns:xlink="http://www.w3.org/1999/xlink">
  <front>
    <journal-meta>
      <journal-title-group>
        <journal-title>EMAIL: m.r.v.d.ven@tue.nl (M.R. van de Ven)
ORCID:</journal-title>
      </journal-title-group>
    </journal-meta>
    <article-meta>
      <title-group>
        <article-title>Designing a Method for Defining and Monitoring Business Model Performance Indicators</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <string-name>Montijn R. van de Ven</string-name>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <aff id="aff0">
          <label>0</label>
          <institution>Eindhoven University of Technology</institution>
          ,
          <addr-line>Groene Loper 3, 5600 MB Eindhoven</addr-line>
          ,
          <country country="NL">The Netherlands</country>
        </aff>
      </contrib-group>
      <pub-date>
        <year>2021</year>
      </pub-date>
      <volume>000</volume>
      <fpage>0</fpage>
      <lpage>0001</lpage>
      <abstract>
        <p>A business model provides a description or architecture of how a company creates, delivers, and captures value. Business model performance management refers to the continuous monitoring of performance indicators and changes in the environment to control business model performance and timely trigger business model (re-)design. The business processes of a company produce a wealth of data and information about a company's operational performance, which may be aggregated to a higher level, i.e., the tactical level of the business model. However, process data may not always be directly mappable to business models because a complex relationship exists between the two concepts. Existing studies provide little insight or guidance on how business model performance indicators can be defined and monitored. To address this knowledge gap, we will employ a design science research approach to develop a method for the definition and monitoring of business model performance indicators. This research aims to contribute to BPM research by exploring the relationship between business models and business processes.</p>
      </abstract>
      <kwd-group>
        <kwd>1 Business Models</kwd>
        <kwd>Performance Indicators</kwd>
        <kwd>Performance Management</kwd>
        <kwd>Business Processes</kwd>
        <kwd>Process Performance</kwd>
        <kwd>Design Science Research</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body>
    <sec id="sec-1">
      <title>1. Research Problem</title>
      <p>
        The business model has become a prominent concept to describe the way a company does business.
It is defined as the design or architecture of how a company creates, delivers, and captures value [
        <xref ref-type="bibr" rid="ref1">1</xref>
        ]. A
business model functions as an interface between a company’s business strategy and its business
processes, including its IT systems [
        <xref ref-type="bibr" rid="ref2 ref3">2, 3</xref>
        ]. While a business model describes a company’s business logic
in a rather abstract way, business processes provide a more detailed representation of how a company
conducts its operations [
        <xref ref-type="bibr" rid="ref4 ref5">4, 5</xref>
        ]. To support the design and definition of business models, scholars have
developed a wide range of business model tools, including the Business Model Canvas [
        <xref ref-type="bibr" rid="ref6">6</xref>
        ], e-3 value
ontology [
        <xref ref-type="bibr" rid="ref7">7</xref>
        ], and Service Dominant Business Model Radar [
        <xref ref-type="bibr" rid="ref8">8, 9</xref>
        ].
      </p>
      <p>
        Business model performance management refers to the continuous monitoring of performance
indicators and changes in the environment to control business model performance and timely trigger
business model (re-)design [10, 11, 12, 13]. From a top-down perspective, monitoring business model
performance allows managers to track whether a business model is implemented effectively [11, 12].
Suppose the performance of an operational business model deviates from its expected performance. In
that case, this may trigger managers to create detailed descriptions and action plans for business model
elements, that can serve as input for business process (re-)design [
        <xref ref-type="bibr" rid="ref5">5, 14</xref>
        ]. From a bottom-up perspective,
the business processes of a company produce a wealth of data and information about the operational
performance of a company [15, 16, 17]. The aggregation of process data to a higher level of the
company, i.e., the tactical level of the business model [
        <xref ref-type="bibr" rid="ref2 ref3">2, 3</xref>
        ], may provide relevant insights about the
configuration of a companies’ business model, as well as the interaction between business model
elements [18].
      </p>
      <p>However, process performance data may not always be directly mappable to business models
because a complex relationship exists between business models and business processes [14, 19, 20].
Since both concepts are interconnected, changes in a company’s business model may affect one or more
of a company’s business processes, and vice versa. The challenge of monitoring the performance of a
business model has become even more pronounced in today’s multi-stakeholder business settings, since
it may require business actors to share potentially sensitive data [21].</p>
      <p>Defining and monitoring business model performance indicators is a relevant way to manage
business model performance [12, 22, 23]. Yet, existing studies provide little insight or guidance on how
business model performance indicators can be defined [24, 25] or how business model performance can
be monitored [22]. Despite the importance of managing business model performance, most business
model monitoring efforts in practice are limited to monitoring financial performance [10]. Although
there are a few studies on business model performance [12, 22, 26, 27, 28, 29], current studies mainly
focus on performance evaluation in the early phases of a business model, i.e., assessing business model
design.</p>
      <p>To address this knowledge gap, this research aims to develop a method to support the definition and
monitoring of business model performance indicators.</p>
    </sec>
    <sec id="sec-2">
      <title>2. Research Design</title>
      <p>To develop the method, a design science research methodology will be employed. Design science
research is a methodology developed in the field of information systems (IS), with the goal to solve
practical problems by designing and developing artifacts [30, 31]. A standard design science research
methodology (DSRM) by Peffers et al. [32] will be followed to design and develop the artifact.
Accordingly, the research process will involve identifying the problem and objectives of the solution
(method), designing and developing the method, applying it in a suitable context, and evaluating it in a
real-life business setting to examine its validity and utility. The primary research activities are
visualized in the research design diagram in Figure 1.</p>
      <p>First, the problem will be identified and motivated through three research activities. The first activity
is a structured literature review (SLR) on business model performance indicators. The goal of this SLR
is to investigate and synthesize the existing knowledge about business model performance. We will
apply the SLR procedure by Kitchenham and Charters [33] to structure our review. The scientific
databases Scopus and Web of Science will be searched to find studies that identify, analyze, and monitor
any kind of performance indicator of business models. We consider the combination of these two
databases to cover the appropriate academic publication venues. Potential keywords for searching the
databases are a combination of the terms ‘business model’, ‘performance indicator’, ‘performance
metric’, and ‘performance measure’.</p>
      <p>As the second activity in the problem identification and motivation phase, we will conduct
exploratory semi-structured interviews with business model experts from academia and practice to gain
a better understanding of the current practices and needs in business model performance management.
To guide the interviews, we will develop an interview protocol based on the results of the literature
review on business model performance indicators. For the selection of the interviewees, we will contact
the key authors of the relevant articles identified in the literature review. Moreover, we will consider
reports on business models performance management from industry to identify practitioners with
relevant practical knowledge.</p>
      <p>The third activity in the first DSR step is to conduct an SLR on existing approaches for defining and
monitoring performance indicators. The definition of performance indicators has been a major field of
study in other research fields, such as Business Process Management (BPM), Enterprise Modeling,
Project Management, and Managerial Accounting. These fields have been more mature than the
business model domain, hence we see a potential to transfer and utilize the existing knowledge from
these fields to business models. Therefore, the goal of this SLR is to find the outstanding work in
relevant fields and analyze the existing approaches for defining and monitoring performance indicators
from a business model perspective. For this literature review, we will apply the forward and backward
snowballing approach by Wohlin [34] to structure our literature search. This snowballing procedure
allows us to identify relevant articles based on a starting set of seminal papers. We aim to examine both
academic and grey literature (e.g., Gartner, BPTrends) that discuss relevant methods and techniques for
defining and monitoring performance indicators.</p>
      <p>The objectives for a solution will be logically derived from the three research activities in the
problem definition and motivation phase [32]. Based on the requirements and knowledge from the
existing literature and business model experts, the initial version of the artifact will be developed. We
will employ a method engineering approach [35] to iteratively design and develop the artifact, i.e., a
method for defining and monitoring business model performance indicators.</p>
      <p>After having designed the initial version of the artifact (i.e., the alpha version), we will demonstrate
and evaluate the artifact in a number of in-house case studies. We plan to organize workshops with
academic experts in our network, and gather feedback to refine and/or restructure the artifact. Based on
the feedback from the in-house case studies, we will develop an initial version of implementation
guidelines for the artifact (i.e., the method of use). After that, the refined artifact and implementation
guidelines (beta version) will be demonstrated and evaluated in a number of real-life case studies with
practitioners to develop the final version of the artifact. For these case studies, business models from
varying domains will be selected to showcase the applicability of the method in different business
settings. The research team has access to such real-life business cases and companies via the ongoing
industry projects in the mobility domain (e.g., UMOS).</p>
      <p>To evaluate the validity and utility of the artifact, we will conduct interviews and set out surveys
among the case study participants. We consider case studies, interviews and surveys to be a relevant
means of evaluation for our research, as the to-be designed artifact is user-oriented and developed for
long-term use by practitioners [36].</p>
      <p>Lastly, the research results will be communicated to researchers and practitioners in the
communication phase. We intend to publish the research in the form of a doctoral dissertation, as well
as in journal articles and conference papers.</p>
      <p>We aim to improve the external validity our research by conducting multiple case studies in which
the use of the method will be demonstrated and evaluated. Construct validity will be improved through
the use of multiple resources and maintaining a chain of evidence in the data collection phase. The
protocols we will define for the exploratory interviews, case studies and expert reviews that are to be
planned for evaluation of the research outcomes will help to increase the reliability of the results.</p>
    </sec>
    <sec id="sec-3">
      <title>3. Intended Solution</title>
      <p>
        The intended solution is an artifact in the form of a method for defining and monitoring business
model performance indicators. The method includes guidelines for defining performance indicators for
business models and monitoring the defined indicators. The to-be designed method is aimed at
practitioners who are responsible for managing the performance of a company’s business model (e.g.,
tactical managers, product owners) and that operate on the tactical level of a company, i.e., between the
strategic and operational level [
        <xref ref-type="bibr" rid="ref2 ref3">2, 3</xref>
        ]. The design and implementation of the artifact will be demonstrated
in real-world case studies, and we will thereby contribute to advancing the knowledge about business
model performance indicators [24, 25] and business model performance management [10, 37, 38].
      </p>
    </sec>
    <sec id="sec-4">
      <title>4. Contributions to BPM Research</title>
      <p>
        This research contributes to BPM research by exploring the complex relationship between business
models and business processes [
        <xref ref-type="bibr" rid="ref3">3, 19</xref>
        ]. We will consider business model performance management
from a top-down as well as a bottom-up perspective. Hence, we propose using process data and process
performance indicators, which are now mainly used at an operational level, by aggregating these to a
higher tactical level, i.e., the level of a business model [
        <xref ref-type="bibr" rid="ref2 ref3">2, 3</xref>
        ]. The method developed in this research
can provide relevant insights about the performance of a company’s business model for researchers and
practitioners, which may serve as high-level input for business process (re-)design [
        <xref ref-type="bibr" rid="ref5">5, 14</xref>
        ].
      </p>
    </sec>
    <sec id="sec-5">
      <title>5. Project Status and Challenges</title>
      <p>At the time of submitting this application, the literature review on business model performance
indicators has started and is still in progress. The next phases of the research are pending. Currently,
there are two main challenges within the research. Firstly, a main challenge pertains with relation to
transferring process performance insights onto business models. While process performance data may
offer relevant information about the performance of a company’s business model, this data may not be
directly mappable to business models [19]. Hence, techniques must be identified that support the
aggregation of performance data into business model performance indicators. Secondly, scholars have
not yet reached a consensus about what dimensions constitute a business model [39]. This may pose as
a challenge for selecting an appropriate set of meta-dimensions for structuring the method for defining
business model performance indicators.</p>
    </sec>
    <sec id="sec-6">
      <title>6. References</title>
      <p>[9] O. Turetken, P. Grefen, R.A.M. Gilsing, O.E. Adali, Service-Dominant Business Model Design
for Digital Innovation in Smart Mobility, Business and Information Systems Engineering. 61
(2019) 9–29. https://doi.org/10.1007/s12599-018-0565-x.
[10] N. Terrenghi, J. Schwarz, C. Legner, U. Eisert, Business model management: current practices,
required activities and IT support, in: Internationale Tagung Wirtschaftsinformatik 2017, 2017.
[11] C. di Valentin, D. Werth, P. Loos, Analysis of IT-Business models towards theory development of
business model transformation and monitoring, in: BMSD 2015 - Proceedings of the 5th
International Symposium on Business Modeling and Software Design, SciTePress, 2015: pp. 171–
177. https://doi.org/10.5220/0005886701710177.
[12] C. di Valentin, A. Emrich, D. Werth, P. Loos, Conceiving Adaptability for Business Models: A</p>
      <p>Literature-based Approach., in: CONF-IRM, 2012: p. 50.
[13] D. Globocnik, R. Faullant, Z. Parastuty, Bridging strategic planning and business model
management – A formal control framework to manage business model portfolios and dynamics,
European Management Journal. 38 (2020) 231–243. https://doi.org/10.1016/j.emj.2019.08.005.
[14] C. di Valentin, T. Burkhart, D. Vanderhaeghen, D. Werth, P. Loos, Towards a Framework for</p>
      <p>Transforming Business Models into Business Processes, in: AMCIS 2012 Proceedings, 2012.
[15] M. Dumas, M. la Rosa, J. Mendling, H.A. Reijers, Fundamentals of business process management,
2nd ed., Springer Berlin Heidelberg, 2018. https://doi.org/10.1007/978-3-662-56509-4.
[16] M. Leyer, D. Heckl, J. Moormann, Process performance measurement, in: Handbook on Business
Process Management 2: Strategic Alignment, Governance, People and Culture, Second Edition,
Springer Berlin Heidelberg, 2015: pp. 227–242. https://doi.org/10.1007/978-3-642-45103-4_9.
[17] A. van Looy, A. Shafagatova, Business process performance measurement: a structured literature
review of indicators, measures and metrics, SpringerPlus. 5 (2016).
https://doi.org/10.1186/s40064-016-3498-1.
[18] D. Augenstein, C. Fleig, Exploring Design Principles for a Business Model Mining Tool., in: ICIS,
2017.
[19] B. Betzwieser, B. Levkovskyi, H. Krcmar, At the Nexus of Business Models and Business
Processes: A Systematic Literature Review, in: 24th Pacific Asia Conference on Information
Systems (PACIS), 2020.
[20] A. Bonakdar, T. Weiblen, C. di Valentin, T. Zeißner, A. Pussep, M. Schief, Transformative
influence of business processes on the business model: classifying the state of the practice in the
software industry, in: 2013 46th Hawaii International Conference on System Sciences, 2013: pp.
3920–3929.
[21] R.A.M. Gilsing, O. Turetken, B. Ozkan, P. Grefen, O.E. Adali, A.M. Wilbik, F. Berkers,
Evaluating the Design of Service-Dominant Business Models: A Qualitative Method, Pacific Asia
Journal of the Association for Information Systems. 13 (2021) 36-70.
[22] M. Heikkilä, H. Bouwman, J. Heikkilä, S. Solaimani, W. Janssen, Business model metrics: an open
repository, Information Systems and E-Business Management. 14 (2016) 337–366.
https://doi.org/10.1007/s10257-015-0286-3.
[23] M. Heikkilä, S. Solaimani, A. Soudunsaari, M. Hakanen, L. Kuivaniemi, M. Suoranta,
Performance estimation of networked business models: case study on a Finnish eHealth Service
Project, Journal of Business Models. 2 (2014) 71–88.
[24] T. Burkhart, J. Krumeich, D. Werth, P. Loos, Analyzing the Business Model Concept – A
Comprehensive Classification of Literature, in: International Conference on Information Systems
2011, 2011.
[25] C. Nielsen, M. Lund, P.P. Thomsen, K.B. Kristiansen, J.C. Sort, C. Byrge, R. Roslender, S.</p>
      <p>Schaper, M. Montemari, A.C.P. Delmar, others, Depicting a performative research Agenda: The
4th stage of business model research, Journal of Business Models. 6 (2018) 59–64.
[26] R. Gilsing, A. Wilbik, P. Grefen, O. Turetken, B. Ozkan, O.E. Adali, F. Berkers, Defining business
model key performance indicators using intentional linguistic summaries, Software and Systems
Modeling 2021. 1 (2021) 1–32. https://doi.org/10.1007/S10270-021-00894-X.
[27] J.M. Mateu, A. Escribá-Esteve, Ex-ante business model evaluation methods: a proposal of
improvement and applicability, Journal of Business Models, 2019, Vol. 7, Num. 5, p. 25-47.
(2019).
[28] M. Montemari, M.S. Chiucchi, C. Nielsen, Designing Performance Measurement Systems Using</p>
      <p>Business Models, Journal of Business Models. 7 (2019) 48–69.
[29] S. Sharma, J.A. Gutiérrez, An evaluation framework for viable business models for m-commerce
in the information technology sector, Electronic Markets. 1 (2010) 33–52.
https://doi.org/10.1007/S12525-010-0028-9.
[30] S. Gregor, A.R. Hevner, Positioning and Presenting Design Science Research for Maximum</p>
      <p>Impact, MIS Quarterly. 37 (2013) 337–355.
[31] A.R. Hevner, S.T. March, J. Park, S. Ram, Design science in information systems research, MIS</p>
      <p>Quarterly. 28 (2004) 75–105.
[32] K. Peffers, T. Tuunanen, M.A. Rothenberger, S. Chatterjee, A design science research
methodology for information systems research, Journal of Management Information Systems. 24
(2007) 45–77.
[33] B. Kitchenham, S. Charters, Guidelines for performing systematic literature reviews in software
engineering, EBSE Technical Report, Keele University and University of Durham, Keele, United
Kingdom, 2007.
[34] C. Wohlin, A. Aurum, Towards a decision-making structure for selecting a research design in
empirical software engineering, Empirical Software Engineering. 20 (2015) 1427–1455.
https://doi.org/10.1007/s10664-014-9319-7.
[35] S. Brinkkemper, Method engineering: engineering of information systems development methods
and tools, Information and Software Technology. 38 (1996) 275–280.
[36] J. Venable, J. Pries-Heje, R. Baskerville, FEDS: a Framework for Evaluation in Design Science
Research, European Journal of Information Systems 2014 25:1. 25 (2014) 77–89.
https://doi.org/10.1057/EJIS.2014.36.
[37] B.W. Wirtz, Business Model Management: Design-Process-Instruments, Springer Nature, 2020.
[38] E. Bucherer, Business Model Innovation - Guidelines for a Structured Approach, Ph.D. thesis,</p>
      <p>University of St. Gallen, St. Gallen, Switzerland, 2010.
[39] N.J. Foss, T. Saebi, Business models and business model innovation: Between wicked and
paradigmatic problems, Long Range Planning. 51 (2018) 9–21.
https://doi.org/10.1016/j.lrp.2017.07.006.</p>
    </sec>
  </body>
  <back>
    <ref-list>
      <ref id="ref1">
        <mixed-citation>
          [1]
          <string-name>
            <given-names>D.J.</given-names>
            <surname>Teece</surname>
          </string-name>
          ,
          <article-title>Business models, business strategy and innovation, Long Range Planning</article-title>
          .
          <volume>43</volume>
          (
          <year>2010</year>
          )
          <fpage>172</fpage>
          -
          <lpage>194</lpage>
          . https://doi.org/10.1016/j.lrp.
          <year>2009</year>
          .
          <volume>07</volume>
          .003.
        </mixed-citation>
      </ref>
      <ref id="ref2">
        <mixed-citation>
          [2]
          <string-name>
            <given-names>M.M.</given-names>
            <surname>Al-Debei</surname>
          </string-name>
          ,
          <string-name>
            <given-names>D.</given-names>
            <surname>Avison</surname>
          </string-name>
          ,
          <article-title>Developing a unified framework of the business model concept</article-title>
          ,
          <source>European Journal of Information Systems</source>
          .
          <volume>19</volume>
          (
          <year>2010</year>
          )
          <fpage>359</fpage>
          -
          <lpage>376</lpage>
          . https://doi.org/10.1057/ejis.
          <year>2010</year>
          .
          <volume>21</volume>
          .
        </mixed-citation>
      </ref>
      <ref id="ref3">
        <mixed-citation>
          [3]
          <string-name>
            <given-names>D.</given-names>
            <surname>Veit</surname>
          </string-name>
          ,
          <string-name>
            <given-names>E.</given-names>
            <surname>Clemons</surname>
          </string-name>
          ,
          <string-name>
            <given-names>A.</given-names>
            <surname>Benlian</surname>
          </string-name>
          ,
          <string-name>
            <given-names>P.</given-names>
            <surname>Buxmann</surname>
          </string-name>
          ,
          <string-name>
            <given-names>T.</given-names>
            <surname>Hess</surname>
          </string-name>
          ,
          <string-name>
            <given-names>D.</given-names>
            <surname>Kundisch</surname>
          </string-name>
          ,
          <string-name>
            <given-names>J.M.</given-names>
            <surname>Leimeister</surname>
          </string-name>
          ,
          <string-name>
            <given-names>P.</given-names>
            <surname>Loos</surname>
          </string-name>
          ,
          <string-name>
            <given-names>M.</given-names>
            <surname>Spann</surname>
          </string-name>
          , Business Models,
          <source>Business &amp; Information Systems Engineering</source>
          <year>2014</year>
          6:
          <issue>1</issue>
          . 6 (
          <year>2014</year>
          )
          <fpage>45</fpage>
          -
          <lpage>53</lpage>
          . https://doi.org/10.1007/S12599-013-0308-Y.
        </mixed-citation>
      </ref>
      <ref id="ref4">
        <mixed-citation>
          [4]
          <string-name>
            <surname>C.M. DaSilva</surname>
          </string-name>
          , P. Trkman,
          <article-title>Business model: What it is and what it is not, Long Range Planning</article-title>
          .
          <volume>47</volume>
          (
          <year>2014</year>
          )
          <fpage>379</fpage>
          -
          <lpage>389</lpage>
          . https://doi.org/10.1016/j.lrp.
          <year>2013</year>
          .
          <volume>08</volume>
          .004.
        </mixed-citation>
      </ref>
      <ref id="ref5">
        <mixed-citation>
          [5]
          <string-name>
            <given-names>B.</given-names>
            <surname>Suratno</surname>
          </string-name>
          ,
          <string-name>
            <given-names>B.</given-names>
            <surname>Ozkan</surname>
          </string-name>
          ,
          <string-name>
            <given-names>O.</given-names>
            <surname>Turetken</surname>
          </string-name>
          ,
          <string-name>
            <given-names>P.</given-names>
            <surname>Grefen</surname>
          </string-name>
          ,
          <article-title>A Method for Operationalizing Service-Dominant Business Models into Conceptual Process Models</article-title>
          ,
          <source>in: Lecture Notes in Business Information Processing</source>
          , Springer Verlag,
          <year>2018</year>
          : pp.
          <fpage>133</fpage>
          -
          <lpage>148</lpage>
          . https://doi.org/10.1007/978-3-
          <fpage>319</fpage>
          -94214-
          <issue>8</issue>
          _
          <fpage>9</fpage>
          .
        </mixed-citation>
      </ref>
      <ref id="ref6">
        <mixed-citation>
          [6]
          <string-name>
            <given-names>A.</given-names>
            <surname>Osterwalder</surname>
          </string-name>
          ,
          <string-name>
            <given-names>Y.</given-names>
            <surname>Pigneur</surname>
          </string-name>
          ,
          <article-title>Business model generation: a handbook for visionaries, game changers, and challengers</article-title>
          , John Wiley &amp; Sons,
          <year>2010</year>
          .
        </mixed-citation>
      </ref>
      <ref id="ref7">
        <mixed-citation>
          [7]
          <string-name>
            <given-names>J.</given-names>
            <surname>Gordijn</surname>
          </string-name>
          ,
          <string-name>
            <given-names>J.M.</given-names>
            <surname>Akkermans</surname>
          </string-name>
          ,
          <article-title>Value-based requirements engineering: exploring innovative ecommerce ideas</article-title>
          ,
          <source>Requirements Engineering</source>
          .
          <volume>8</volume>
          (
          <year>2003</year>
          )
          <fpage>114</fpage>
          -
          <lpage>134</lpage>
          .
        </mixed-citation>
      </ref>
      <ref id="ref8">
        <mixed-citation>
          [8]
          <string-name>
            <given-names>E.</given-names>
            <surname>Lüftenegger</surname>
          </string-name>
          ,
          <article-title>Service-dominant business design</article-title>
          ,
          <source>Ph.D. thesis</source>
          , Eindhoven University of Technology, Eindhoven, The Netherlands,
          <year>2014</year>
          .
        </mixed-citation>
      </ref>
    </ref-list>
  </back>
</article>