Sriram Sankaranarayanan Henny B. Sipma Zohar Manna Constraint-Based Linear-Relations Analysis. 53-68 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3148&spage=53 2004 conf/sas/2004 SAS db/conf/sas/sas2004.html#SankaranarayananSM04