D. Bollegala, Y. Matsuo, and M. Ishizuka. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 757--766. New York, NY, USA, ACM, (2007)
N. Yuruk, M. Mete, X. Xu, and T. Schweiger. ICDMW '07: Proceedings of the Seventh IEEE International Conference on Data Mining Workshops, page 441--448. Washington, DC, USA, IEEE Computer Society, (2007)