1. Contstraint Handling Rules, http://dtai.cs.kuleuven.be/CHR/
2. Core language for asp solver competitions. Minutes of the steering committee meeting at LPNMR (2004), https://www.mat.unical.it/aspcomp2011/files/Corelang2004.pdf
3. The CADE ATP System Competition, http://www.cs.miami.edu/~tptp/CASC/
4. The Satisfiability Modulo Theories Library, http://www.smtlib.org/
5. Alviano, M., Faber, W., Greco, G., Leone, N.: Magic sets for disjunctive datalog programs. Tech. Report 09/2009, Dipartimento di Matematica, Università della Calabria, Italy (2009), http://www.wfaber.com/research/papers/TRMAT092009.pdf