R. Cameron-Jones, and J. Quinlan. Proceedings of the 13th International Joint Conference on Artificial Intelligence, page 1050--1057. Morgan Kaufmann, (1993)
M. Hofmann, E. Kitzelmann, and U. Schmid. German Conference on Artificial Intelligence (KI'08), volume 5243 of LNAI, page 78--86. Springer-Verlag, (2008)
F. Esposito, D. Malerba, and F. Lisi. Proceedings of the 10th International Conference on Inductive Logic Programming (ILP'2000), volume 1866 of LNCS, page 93--111. Springer-Verlag, (2000)
M. Furusawa, N. Inuzuka, H. Seki, and H. Itoh. Proceedings of the 7th International Workshop on Inductive Logic Programming (ILP'97), volume 1297 of LNCS, page 165--172. Springer-Verlag, (1997)
R. Rios, and S. Matwin. Proceedings of the 11th Biennial Conference of the Canadian Society for Computational Studies of Intelligence on Advances in Artificial Intelligence, volume 1081 of LNCS, page 240--248. Springer-Verlag, (1996)
N. Inuzuka, M. Kamo, N. Ishii, H. Seki, and H. Itoh. Proceedings of the 6th International Workshop on Inductive Logic Programming (ILP'96), volume 1314 of LNCS, page 265--282. Springer-Verlag, (1997)