Ricardo Saldanha Ernesto M. Morgado Solving Set Partitioning Problems with Global Constraint Propagation. 101-115 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2902&spage=101 2003 conf/epia/2003 EPIA db/conf/epia/epia2003.html#SaldanhaM03