Panagiotis Adamopoulos 1 Emory University 0 Eurecat, Universidad Autonoma de Madrid, Universidad Autonoma de Madrid, Universita' degli Studi di Torino, Politecnico di Milano, University of Bari 'Aldo Moro', Georg-Eckert-Institute for international Textbook, Research, Politecnico di Bari, Aalborg University, Open University, Universidad de Granada, Universita' degli Studi di Torino, The University of She eld, Universidad de Granada, University of Amsterdam, DPG Media AI, University of Bari 'Aldo Moro', University of Bari 'Aldo Moro' , Sampension, Intuit AI , Johannes Kepler University , DNB Ludovico Boratto , Ivan Cantador, Pablo Castells, Federica Cena, Paolo Cremonesi, Marco de Gemmis, Ernesto William De Luca

We thank the members of ComplexRec 2019 program committee for their time and e ort to provide timely and constructive reviews of the submitted papers.