C. Veres. Natural Language Processing and Information Systems, Volume 3999/2006 von Lecture Notes in Computer Science, Seite 58-69. Berlin / Heidelberg, Springer, (Juli 2006)
H. Wu, M. Zubair, und K. Maly. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext and hypermedia, Seite 111--114. New York, NY, USA, ACM Press, (2006)
X. Wu, L. Zhang, und Y. Yu. WWW '06: Proceedings of the 15th international conference on World Wide Web, Seite 417--426. New York, NY, USA, ACM Press, (2006)