S. Xu, S. Bao, B. Fei, Z. Su, and Y. Yu. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 155--162. New York, NY, USA, ACM, (2008)
S. Xu, S. Bao, B. Fei, Z. Su, and Y. Yu. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 155--162. New York, NY, USA, ACM, (2008)