Xue, Gui-Rong, Zeng, Hua-Jun, Chen, Zheng, Yu, Yong, Ma, Wei-Ying, Xi, WenSi and Fan, WeiGuo. "Optimizing web search using web click-through data." Paper presented at the meeting of the CIKM '04: Proceedings of the thirteenth ACM international conference on Information and knowledge management, New York, NY, USA, 2004.