D. Sculley, and G. Wachman. Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval, page 415--422. New York, NY, USA, ACM, (2007)
D. Sculley, and G. Wachman. Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval, page 415--422. New York, NY, USA, ACM, (2007)