Y. Song, L. Zhang, und C. Giles. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge mining, Seite 93--102. New York, NY, USA, ACM, (2008)
K. Tso-Sutter, L. Marinho, und L. Schmidt-Thieme. SAC '08: Proceedings of the 2008 ACM symposium on Applied computing, Seite 1995--1999. New York, NY, USA, ACM, (2008)
B. Sigurbjörnsson, und R. van Zwol. WWW '08: Proceeding of the 17th International Conference on World Wide Web, Seite 327--336. New York, NY, USA, ACM, (2008)