Jianguo Ding Jun Zhang Yingcai Bai Hansheng Chen One Backward Inference Algorithm in Bayesian Networks. 72-75 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3320&spage=72 2004 conf/pdcat/2004 PDCAT db/conf/pdcat/pdcat2004.html#DingZBC04