Robert Nieuwenhuis Albert Oliveras Enric Rodríguez-Carbonell Albert Rubio Challenges in Satisfiability Modulo Theories. 2-18 2007 conf/rta/2007 RTA http://dx.doi.org/10.1007/978-3-540-73449-9_2 db/conf/rta/rta2007.html#NieuwenhuisORR07