J. Hernández-Orallo, and M. Ramírez-Quintana. Proc. of 9th International Workshop on Inductive Logic Programming, volume 1634 of Lecture Notes in Artificial Intelligence, Springer-Verlag, Berlin, (1999)
J. Hernández, and M. Ram\'ırez. Proc. of 9th International Workshop on Inductive Logic
Programming, volume 1634 of Lecture Notes in Artificial Intelligence, Springer-Verlag, Berlin, (1999)