Vijay D'Silva Mitra Purandare Daniel Kroening Approximation Refinement for Interpolation-Based Model Checking. 68-82 2008 VMCAI http://dx.doi.org/10.1007/978-3-540-78163-9_10 conf/vmcai/2008 db/conf/vmcai/vmcai2008.html#DSilvaPK08