Stefano Bistarelli Philippe Codognet Kin Chuen Hui Jimmy Ho-Man Lee Solving Finite Domain Constraint Hierarchies by Local Consistency and Tree Search. 138-152 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2833&spage=138 2003 conf/cp/2003 CP db/conf/cp/cp2003.html#BistarelliCHL03