Bart Jacobs Erik Poll Java Program Verification at Nijmegen: Developments and Perspective. 134-153 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3233&spage=134 2003 conf/isss2/2003 ISSS db/conf/isss2/isss2003.html#JacobsP03