Bahareh Badban Jaco van de Pol Olga Tveretina Hans Zantema Generalizing DPLL and satisfiability for equalities. 1188-1211 2007 205 Inf. Comput. 8 http://dx.doi.org/10.1016/j.ic.2007.03.003 db/journals/iandc/iandc205.html#BadbanPTZ07