K. Tso-Sutter, L. Marinho, and L. Schmidt-Thieme. SAC '08: Proceedings of the 2008 ACM symposium on Applied computing, page 1995--1999. New York, NY, USA, ACM, (2008)
C. Firan, W. Nejdl, and R. Paiu. LA-WEB '07: Proceedings of the 2007 Latin American Web Conference, page 32--41. Washington, DC, USA, IEEE Computer Society, (2007)
B. Sigurbjörnsson, and R. van Zwol. WWW '08: Proceeding of the 17th International Conference on World Wide Web, page 327--336. New York, NY, USA, ACM, (2008)