Xavier Gandibleux Xavier Delorme Vincent T'Kindt An Ant Colony Optimisation Algorithm for the Set Packing Problem. 49-60 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3172&spage=49 2004 conf/antsw/2004 ANTS Workshop db/conf/antsw/antsw2004.html#GandibleuxDT04