- Ahmet Soylu, Alireza Tamaddoni-Nezhad, Nikolay Nikolov, Ioan Toma, Anna Fensel, Joost Vennekens, editors, Proceedings of the 15th International Rule Challenge, 7th Industry Track, and 5th Doctoral Consortium @ RuleML+RR 2021 co-located with 17th Reasoning Web Summer School (RW 2021) and 13th DecisionCAMP 2021 as part of Declarative AI 2021, Leuven, Belgium (virtual due to Covid-19 pandemic), 8 - 15 September, 2021. Volume 2956 of CEUR Workshop Proceedings, CEUR-WS.org, 2021.
- Sotiris Moschoyiannis, Rafael Peñaloza, Jan Vanthienen, Ahmet Soylu, Dumitru Roman, editors, Rules and Reasoning - 5th International Joint Conference, RuleML+RR 2021, Leuven, Belgium, September 13-15, 2021, Proceedings. Volume 12851 of Lecture Notes in Computer Science, Springer, 2021.