T. Bogers, и A. van den Bosch. RecSys '08: Proceedings of the 2008 ACM conference on Recommender systems, стр. 287--290. New York, NY, USA, ACM, (2008)
R. Bunescu, и M. Pasca. Proceedings of the 11th Conference of the European Chapter of the Association for Computational Linguistics (EACL-06), Trento, Italy, стр. 9-16. (апреля 2006)
C. Cattuto, D. Benz, A. Hotho, и G. Stumme. The Semantic Web - ISWC 2008, том 5318 из Lecture Notes in Computer Science, стр. 615--631. Springer Berlin / Heidelberg, (2008)