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Bernard J. Jansen Library & Information Science Research 28(3):407--432 (2006)

Jill Freyne, Barry Smyth, Maurice Coyle, Evelyn Balfe, and Peter Briggs Artif. Intell. Rev. 21(3-4):229-252 (2004)

Beate Krause, Robert Jäschke, Andreas Hotho, and Gerd Stumme HT '08: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia, page 157--166. New York, NY, USA, ACM, (2008)

S. Zhua, J. Wua, H. Xiongb, and G. Xiaa (2009)

Ricardo Baeza-Yates (2008)