Gunnar Tufte Pauline C. Haddow Building Knowledge into Developmental Rules for Circuit Design. 69-80 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2606&spage=69 2003 conf/ices/2003 ICES db/conf/ices/ices2003.html#TufteH03