1. G. Bisson. K.b.g., a knowledge base generalizer. In Proc. of the seventh Int. Conf. on Machine Learning, pages 9–16, Austin, TX, 1990.
2. F. Bergadano and L. Saitta. On the error probability of boolean concept descriptions. In K. Morik, editor, EWSL89 — Proc. of the 4th Europ. Working Session on Learning, pages 25–36, Pitman, London, 1989.
3. B. Chandrasekaran. From numbers to symbols to knowledge structures: Pattern Recognition and Artificial Intelligence Perspectives on the classification task. In E. S. Gelsema and L. N. Kanal, editors, Pattern Recognition in Practice, Vol. 2, North Holland, 1988.
4. L. DeRaedt and M. Bruynooghe. Towards friendly concept-learners. In Proc. of the 11th Int. Joint Conf. on Artif. Intelligence, pages 849–854, Morgan Kaufman, Los Altos, CA, 1989.
5. F. Esposito. Automated Acquisition of Production Rules by Empirical Supervised Learning Methods. In M. Schader and W. Gaul, editors, Knowledge, Data and Computer Assisted Decisions, Springer-Verlag, 1990.