J. Huang, Z. Zhuang, J. Li, and C. Giles. Proceedings of the 2008 International Conference on Web Search and Data Mining, page 107--116. New York, NY, USA, ACM, (2008)
Q. He, D. Kifer, J. Pei, P. Mitra, and C. Giles. Proceedings of the fourth ACM international conference on Web search and data mining, page 755--764. New York, NY, USA, ACM, (2011)