In 27 Congreso Nacional de Estadística e Investigación Operativa, Lleida, Spain, April 2003.
In F. J. Garijo, J.C. Riquelme, and M. Toro, editors, Advances in Artificial Intelligence - IBERAMIA 2002, 8th Ibero-American Conference on AI, Seville, Spain, November 12-15, 2002, Proceedings, volume 2527 of Lecture Notes in Computer Science, pages 182-192. Springer, 2002.
Mathematical and Computer Modelling, 27:75-99, 1998.
Lecture Notes in Computer Science, 1184:575-585, 1996.
In D.S. Johnson and M.A. Trick, editors, Cliques, Coloring, and Satisfiability: The Second DIMACS Implementation Challenge, volume 26 of DIMACS Series on Discrete Mathematics and Theoretical Computer Science, pages 499-520. American Mathematical Society, 1996.
In J. Gu and P.M. Pardalos, editors, Satisfiability problems, volume 35 of DIMACS Series on Discrete Mathematics and Theoretical Computer Science, pages 393-405. American Mathematical Society, 1997.
Discrete Applied Mathematics, 100:95-113, 2000.
Mathematical and Computer Modelling, 37:219-233, 2003.