Selçuk Kavut Melek D. Yücel Improved Cost Function in the Design of Boolean Functions Satisfying Multiple Criteria. 121-134 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2904&spage=121 2003 conf/indocrypt/2003 INDOCRYPT db/conf/indocrypt/indocrypt2003.html#KavutY03