6SALTON G, McGILL M J. Introdocution to modern information retrieval[ M] . New York: McGraw-Hill, 1983.
7YANG Yi-ming. An evaluation of statistical approaches to text categorization[J] . Journal of Information Retrieval, 1999 , 1 ( 1 /2 ) : 67-88.
8LEWIS D D, RINGUETTE M. A comparison of two learning algorithms of text categorization[ C] / / Proc of the 3rd Annual Symposium on Document Analysis and Information Retrieval. Las Vegas: [ s.n. ] , 1994 : 81- 93.
9CAVNAR W B, TRENKLE J M. N-gram-based text categorization [ C] / / Proc of the 3rd Annual Symposium on Document Analysis and Information Retrieval. Las Vegas: [ s. n. ] , 1994: 161 -176.
10MANNING C D, SCH??TZE H. Foundations of statistical natural language processing[ M] . 中文简体版. 北京: 电子工业出版社, 2002:355- 375 .
