R. Jäschke, L. Marinho, A. Hotho, L. Thieme, and G. Stumme. Proceedings of the 11th European conference on Principles and Practice of Knowledge Discovery in Databases, volume 4702 of PKDD 2007, page 506--514. Berlin, Heidelberg, Springer-Verlag, (2007)
F. Suchanek, M. Vojnovic, and D. Gunawardena. Proceedings of the 17th ACM Conference on Information and Knowledge Management, page 223--232. New York, NY, USA, ACM, (2008)
S. Sen, J. Vig, and J. Riedl. IUI '09: Proceedings of the 13th international conference on Intelligent user interfaces, page 87--96. New York, NY, USA, ACM, (2009)
Y. Song, Z. Zhuang, H. Li, Q. Zhao, J. Li, W. Lee, and C. Giles. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 515--522. New York, NY, USA, ACM, (2008)