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)
Y. Li, G. Kennedy, F. Davies, and J. Hunter. Proceedings of the role of digital libraries in a time of global change, and 12th international conference on Asia-Pacific digital libraries, page 179--188. Berlin, Heidelberg, Springer-Verlag, (2010)