A. Kartal, S. Doerfel, A. Roßnagel, и G. Stumme. Informatik 2011 - Informatik schafft Communities - Proceedings der 41. GI-Jahrestagung, том 192 из Lecture Notes in Informatics, стр. 412. Gesellschaft für Informatik e.V. (GI), Bonner Köllen Verlag, (октября 2011)
F. Mitzlaff, S. Doerfel, A. Hotho, R. Jäschke, и J. Mueller. 15th Discovery Challenge of the European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, ECML PKDD 2013, Prague, Czech Republic - October 27, 2013. Proceedings, 1120, стр. 7-24. Aachen, Germany, CEUR-WS, (2014)
J. Mueller, S. Doerfel, M. Becker, A. Hotho, и G. Stumme. Proceedings of the Fifth ACM RecSys Workshop on Recommender Systems and the Social Web co-located with the 7th ACM Conference on Recommender Systems (RecSys 2013) Hong Kong, China, October 13, 2013., 1066, CEUR-WS, (2013)