1. Ackermann, W. (1954). Solvable cases of the decision problem. Studies in logic and the foundations of mathematics. North-Holland, Amsterdam.
2. Apt, K. R., & Wallace, M. (2007). Constraint logic programming using eclipse. New York: Cambridge University Press.
3. Banković, M., & Marić, F. (2010). An Alldifferent constraint solver in SMT. In Proceedings of the 8th international workshop on satisfiability modulo theories.
4. Barrett, C., Stump, A., & Tinelli, C. (2010). The Satisfiability Modulo Theories Library (SMT-LIB). http://www.SMT-LIB.org . Accessed 16 May 2012.
5. Barrett, C., Stump, A., & Tinelli, C. (2010). The SMT-LIB standard: Version 2.0. In Proceedings of the 8th international workshop on satisfiability modulo theories.