J. Leskovec, K. Lang, and M. Mahoney. WWW '10: Proceedings of the 19th international conference on World wide web, page 631--640. New York, NY, USA, ACM, (2010)
M. Stollberg, M. Hepp, and J. Hoffmann. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 477--490. Berlin, Heidelberg, Springer Verlag, (November 2007)
M. Dittenbach, H. Berger, and D. Merkl. WI '06: Proceedings of the 2006 IEEE/WIC/ACM International Conference on Web Intelligence, page 309--312. Washington, DC, USA, IEEE Computer Society, (2006)