Jeong Ho Chang Jae Won Lee Yuseop Kim Byoung-Tak Zhang Topic Extraction from Text Documents Using Multiple-Cause Networks. 434-443 2002 conf/pricai/2002 PRICAI http://link.springer.de/link/service/series/0558/bibs/2417/24170434.htm db/conf/pricai/pricai2002.html#ChangLKZ02