1. Baader, F., Calvanese, D., McGuinness, D., Nardi, D., Patel-Schneider, P. (eds.): The Description Logic Handbook. Cambridge University Press, Cambridge (2003)
2. Haussler, D.: Learning conjuntive concepts in structural domains. Machine Learning 4, 7–40 (1989)
3. Lecture Notes in Artificial Intelligence;S. Nienhuys-Cheng,1999
4. Lecture Notes in Artificial Intelligence;C. Rouveirol,2000
5. Lecture Notes in Artificial Intelligence;J.U. Kietz,2003