T. Sandholm, und H. Ung. Proceedings of the 2011 Workshop on Context-awareness in Retrieval and Recommendation, Seite 14--18. New York, NY, USA, ACM, (2011)
D. Parra, und P. Brusilovsky. Proceedings of the Workshop on Web 3.0: Merging Semantic Web and Social Web, Volume 467 von CEUR Workshop Proceedings, (Juni 2009)