Timo Latvala Armin Biere Keijo Heljanko Tommi A. Junttila Simple Is Better: Efficient Bounded Model Checking for Past LTL. 380-395 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3385&spage=380 2005 conf/vmcai/2005 VMCAI db/conf/vmcai/vmcai2005.html#LatvalaBHJ05