1. Zadeh, L.: Fuzzy sets and systems. In: Proc. Symp. on Systems Theory, pp. 29–37. Polytechnic Institute of Brooklyn, New York (1965)
2. Pal, N.R., Pal, S.K.: Object-background segmentation using new definitions of entropy. IEEE Proc. 36, 284–295 (1989)
3. Kosko, B.: Neural Networks and Fuzzy Systems. Prentice-Hall, Englewood Cliffs (1992)
4. Liu, X.: Entropy, distance measure and similarity measure of fuzzy sets and their relations. Fuzzy Sets and Systems 52, 305–318 (1992)
5. Bhandari, D., Pal, N.R.: Some new information measure of fuzzy sets. Inform. Science 67, 209–228 (1993)