Takashi Yukawa Kaname Kasahara Tsuneaki Kato Toshiro Kita An Expert Recommendation System Using Concept-Based Relevance Discernment. 257-264 2001 ICTAI http://computer.org/proceedings/ictai/1417/14170257abs.htm db/conf/ictai/ictai2001.html#YukawaKKK01