1. Lecture Notes in Computer Science;F. Besson,2003
2. Bueno, F., Cabeza, D., Carro, M., Hermenegildo, M., López-García, P., Puebla, G. (eds.): The Ciao System. Reference Manual (v1.10). The ciao system documentation series–TR, School of Computer Science, Technical University of Madrid (UPM) (June 2004), system and on-line version of the manual available at http://clip.dia.fi.upm.es/Software/Ciao/
3. Lecture Notes in Computer Science;F. Bueno,1996
4. Lecture Notes in Computer Science;F. Bueno,2001
5. Lecture Notes in Artificial Intelligence;D. Cabeza,2000