Qian Wang Gopal Gupta Michael Leuschel Towards Provably Correct Code Generation via Horn Logical Continuation Semantics. 98-112 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3350&spage=98 2005 conf/padl/2005 PADL db/conf/padl/padl2005.html#WangGL05