=Volume=
{{Volume
|number=2956
|storemode=property
|wikidataid=Q113541999
|title=Proceedings of the 15th International Rule Challenge, 7th Industry Track, and 5th Doctoral Consortium @ RuleML+RR 2021
|acronym=RuleML+RR-Companion 2021
|url=http://ceur-ws.org/Vol-2956/
|date=2021-09-27
|dblp=conf/ruleml/2021s
|k10plus=1779774745
|urn=urn:nbn:de:0074-1155-8
}}