1. Bratko, I., Mozetič, I. & Lavrač, N. (1989) KARDIO: A study in deep and qualitative knowledge for expert systems. Boston, MA: The MIT Press.
2. Cestnik, B. & Bratko, I. (1988) Learning redundant rules in noisy domains. Proc. European Conference on Artificial Intelligence, ECAI-88, Muenchen, Germany.
3. Cestnik, B., Kononenko, I. & Bratko, I. (1987) ASSISTANT 86: A knowledge-elicitation tool for sophisticated users. In: Bratko, I. & Lavrač, N. (eds.) Progress in machine learning. Wilmslow: Sigma Press.
4. Clark, P. & Niblett, T. (1989) The CN2 induction algorithm. Machine Learning 1 (3), 261–284. Kluwer Academic Publishers.
5. Dietterich, T.G. & Michalski, R.S. (1986) Learning to predict sequences. In: Michalski, R.S., Carbonell, J.G. & Mitchell, T.M. (eds.) Machine learning: An artificial intelligence approach (Volume 2). Los Altos: Morgan Kaufmann.