K. Smets, B. Goethals, and B. Verdonk. Proceedings of the Association for the Advancement of Artificial Intelligence (AAAI) Workshop on Wikipedia and Artificial Intelligence: An Evolving Synergy (WikiAI08), page 43--48. AAAI Press, (2008)
Y. Yang, J. Zhang, and B. Kisiel. Proc. of SIGIR-03and 26th ACM International Conference on Research and Development in Information Retrieval, page 96-103. ACM Press, (August 2003)