Thomas Philip Runarsson Constrained Evolutionary Optimization by Approximate Ranking and Surrogate Models. 401-410 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3242&spage=401 2004 conf/ppsn/2004 PPSN db/conf/ppsn/ppsn2004.html#Runarsson04