1. Bezdek, J. C., Pattern Recognition with Fuzzy Objective Function Algorithms, (Plenum Press, New York, 1981).
2. Dubois, D., Prade, H., Fuzzy Sets and Systems: Theory and Applications, (Academic Press, New York, 1980).
3. Dubois, D., Prade, H., ‘A Unifying View of Comparison Indices in a Fuzzy Set-Theoretic Framework’, Fuzzy Sets and Possibility Theory-Recent Developments, Pergamon Press, (1982), pp. 1–13.
4. Intan, R., Mukaidono, M., Yao, Y.Y., ‘Generalization of Rough Sets with α-coverings of the Universe Induced by Conditional Probability Relations’, Proceedings of International Workshop on Rough Sets and Granular Computing, (2001), pp.173–176.
5. Intan, R., Mukaidono, M., ‘Conditional Probability Relations in Fuzzy Relational Database’, Proceedings of RSCTC’00, (2000), pp.213–222.