K. Lang. Proceedings of the 12th International Conference on Machine Learning, стр. 331--339. Morgan Kaufmann publishers Inc.: San Mateo, CA, USA, (1995)
B. Fonseca, P. Golgher, B. Pôssas, B. Ribeiro-Neto, и N. Ziviani. CIKM '05: Proceedings of the 14th ACM international conference on Information and knowledge management, стр. 696--703. New York, NY, USA, ACM Press, (2005)
G. Salton, и C. Buckley. SIGIR '88: Proceedings of the 11th annual international ACM SIGIR conference on Research and development in information retrieval, стр. 147--160. New York, NY, USA, ACM Press, (1988)