Francisco Bueno Pedro López-García Manuel V. Hermenegildo Multivariant Non-failure Analysis via Standard Abstract Interpretation. 100-116 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2998&spage=100 2004 conf/flops/2004 FLOPS db/conf/flops/flops2004.html#BuenoLH04