1. Klassenlogik;Glubrecht,1983
2. Computer Systems That Learn: Classification and Prediction Methods from Statistics, Neural Nets, Machine Learning, and Expert Systems. Machine Learning;Kulikowski,1991
3. Fuzzy Set Theory: Foundations and Applications;Klir,1997
4. Fuzzy Set Theory and its Applications;Zimmermann,2001
5. Fuzzy sets;Zadeh;Information and Control,1965