Krzysztof Socha Joshua D. Knowles Michael Sampels A MAX-MIN Ant System for the University Course Timetabling Problem. 1-13 2002 conf/antalg/2002 Ant Algorithms http://link.springer.de/link/service/series/0558/bibs/2463/24630001.htm db/conf/antalg/antalg2002.html#SochaKS02