Bernhard Reus Jan Schwinghammer Denotational Semantics for Abadi and Leino's Logic of Objects. 263-278 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3444&spage=263 2005 conf/esop/2005 ESOP db/conf/esop/esop2005.html#ReusS05