Steven Bogaerts David B. Leake Facilitating CBR for Incompletely-Described Cases: Distance Metrics for Partial Problem Descriptions. 62-76 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3155&spage=62 2004 conf/ewcbr/2004 ECCBR db/conf/ewcbr/eccbr2004.html#BogaertsL04