Claude-Guy Quimper Peter van Beek Alejandro López-Ortiz Alexander Golynski Sayyed Bashir Sadjad An Efficient Bounds Consistency Algorithm for the Global Cardinality Constraint. 600-614 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2833&spage=600 2003 conf/cp/2003 CP db/conf/cp/cp2003.html#QuimperBLGS03