- Recommender Systems for the Social Web, volume 32 of Intelligent Systems Reference Library, Springer, Berlin/Heidelberg, (2012)
- Recommender Systems Handbook, Springer, New York, (2011)
- Computational Science – ICCS 2006, page 1114-1117. Springer Berlin / Heidelberg, (2006)
- Workshop Proceedings of Lernen -- Wissensentdeckung -- Adaptivität LWA 2007, page 50-54. Martin-Luther-Universität Halle-Wittenberg, (September 2007)
- Proceedings of the 3rd Workshop on Ontology Learning and Population OLP3, Patras, Greece, (July 2008)
- Workshop Proceedings of Lernen - Wissensentdeckung - Adaptivität LWA 2007, page 13-20. Martin-Luther-Universität Halle-Wittenberg, (September 2007)
- Special Issue of the Computer Networks journal on Innovations in Web Communications Infrastructure (2007)
- Banff, Canada, (2007)
- page 273-290. Springer, (2006)
- Commun. ACM 40(3):63--65 (1997)


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