Francesco Ranzato Olivia Rossi-Doria Francesco Tapparo A Forward-Backward Abstraction Refinement Algorithm. 248-262 2008 VMCAI http://dx.doi.org/10.1007/978-3-540-78163-9_22 conf/vmcai/2008 db/conf/vmcai/vmcai2008.html#RanzatoRT08