8Yang Y, Pedersen J O. A comparative study on feature selection in text categorization. 1997. http ://eiteseer. ist. psu. edu/yang97comparative. html. ( Accessed Sep. 10,2004).
9Franca Debole, Fabrizio Sebastiani. Supervised Term Weighting for Automated Text Categorization. 2003. http ://citeseer. ist. psu. edu/572661. html ( Accessed Sep. 10,2004).
10Yiming Yang, Xin Liu. A re - examination of text categorization methods. Proceedings of ACM SIGIR Conference on Research and Development in Information Retrieval, 1999:42-49.
