Tom W. Carnduff Jeevani Samantha Goonetillake Managing Configuration with Evolving Constraints in Design Databases. 88-99 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2784&spage=88 2002 conf/er/2002 ER (Workshops) db/conf/er/erw2002.html#CarnduffG02