B. Li, Q. Yang, und X. Xue. Proceedings of the 21st international jont conference on Artifical intelligence, Seite 2052--2057. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2009)
B. Li, Q. Yang, und X. Xue. Proceedings of the 26th Annual International Conference on Machine Learning, Seite 617--624. New York, NY, USA, ACM, (2009)
Y. Song, Z. Zhuang, H. Li, Q. Zhao, J. Li, W. Lee, und C. Giles. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, Seite 515--522. New York, NY, USA, ACM, (2008)