Hyun-Kyu Kang Yi-Gyu Hwang Pum-Mo Ryu An Effective Document Classification System Based on Concept Probability Vector. 457-462 https://doi.org/10.1007/978-3-540-30483-8_56 2004 conf/awcc/2004 AWCC db/conf/awcc/awcc2004.html#KangHR04