F. Abel, N. Henze, E. Herder, G. Houben, D. Krause, and E. Leonardi. Proceedings of the International Workshop on Architectures and Building Blocks of Web-Based User-Adaptive Systems (WABBWUAS 2010), 609, CEUR-WS.org, (June 2010)
A. Singla, and I. Weber. WSDM '09: Proceedings of the Second ACM International Conference on Web Search and Data Mining, page 252--261. New York, NY, USA, ACM, (2009)
B. Pereira Nunes, R. Kawase, S. Dietze, D. Taibi, M. Casanova, and W. Nejdl. Proceedings of the Web of Linked Entities Workshop in conjuction with the 11th International Semantic Web Conference, volume 906 of CEUR-WS.org, page 45--57. (November 2012)
S. Fortunato, and C. Castellano. (2007)cite arxiv:0712.2716Comment: 42 pages, 13 figures. Chapter of Springer's Encyclopedia of Complexity and System Science.