Yuseop Kim Jung-Seok Oh Jae Young Lee Jeong Ho Chang An Intelligent Grading System for Descriptive Examination Papers Based on Probabilistic Latent Semantic Analysis. 1141-1146 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3339&spage=1141 2004 conf/ausai/2004 Australian Conference on Artificial Intelligence db/conf/ausai/ausai2004.html#KimOLC04