Bernd Scheuermann Martin Middendorf Counter-Based Ant Colony Optimization as a Hardware-Oriented Meta-heuristic. 235-244 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3449&spage=235 2005 conf/evoW/2005 EvoWorkshops db/conf/evoW/evoW2005.html#ScheuermannM05