Carlos A. Silva Thomas A. Runkler João Miguel da Costa Sousa J. M. Sá da Costa Optimization of Logistic Processes in Supply-Chains Using Meta-heuristics. 9-23 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2902&spage=9 2003 conf/epia/2003 EPIA db/conf/epia/epia2003.html#SilvaRSC03