C. Trattner, P. Singer, D. Helic, и M. Strohmaier. Proceedings of the 12th International Conference on Knowledge Management and Knowledge Technologies, стр. 14:1--14:8. New York, NY, USA, ACM, (2012)
M. Koolen, G. Kazai, и N. Craswell. WSDM '09: Proceedings of the Second ACM International Conference on Web Search and Data Mining, стр. 44--53. New York, NY, USA, ACM, (2009)