C. A. R. Hoare The Verifying Compiler: A Grand Challenge for Computing Research. 1-12 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2890&spage=1 2003 conf/ershov/2003 Ershov Memorial Conference db/conf/ershov/ershov2003.html#Hoare03