Egon Börger The ASM Ground Model Method as a Foundation for Requirements Engineering. 145-160 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2772&spage=145 2003 conf/birthday/2003manna Verification: Theory and Practice db/conf/birthday/Manna2003.html#Borger03