1. Adsolver, http://www.cs.ttu.edu/~mellarko/adsolver.html
2. GNU Prolog, http://www.gprolog.org
3. Rcs, http://www.krlab.cs.ttu.edu/Software/Download/rcs/
4. Balduccini, M.: Answer Set Based Design of Highly Autonomous, Rational Agents. PhD thesis, Texas Tech University (December, 2005)
5. Balduccini, M.: CR-models: An inference engine for CR-prolog. In: Logic Programming and Nonmonotonic Reasoning (May, 2007)