Y. Yang, и X. Liu. SIGIR '99: Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval, стр. 42--49. New York, NY, USA, ACM Press, (1999)
Y. Yang, и X. Liu. SIGIR '99: Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval, стр. 42--49. New York, NY, USA, ACM Press, (1999)