Aaron R. Bradley Zohar Manna Henny B. Sipma Termination of Polynomial Programs. 113-129 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3385&spage=113 2005 conf/vmcai/2005 VMCAI db/conf/vmcai/vmcai2005.html#BradleyMS05