1. Mathematical Methods of Classical Mechanics;Arnold,1978
2. Fuzzy differential inclusions;Aubin;Prob. Control Inform. Theory,1990
3. T. Biglic, I.B. Turksen, Measurement of membership function on the theoretical and empirical work, Handbook of Fuzzy Systems, vol. 1, Foundation, NY, to appear.
4. On Triangular Norm-Based Propositional Fuzzy Logic;Butnariu,1994
5. Methods of Mathematical Physics;Courant,1953