Karl Doerner Richard F. Hartl Guenter Kiechle Mária Lucká Marc Reimann Parallel Ant Systems for the Capacitated Vehicle Routing Problem. 72-83 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3004&spage=72 2004 conf/evoW/2004cop EvoCOP db/conf/evoW/evocop2004.html#DoernerHKLR04