[1] A. Kaufmann:
Introduction to the Theory of Fuzzy Subsets. Vol. 1: Fundamental Theoretical Elements. Academic Press, New York 1975.
MR 0485402 |
Zbl 0332.02063
[2] D. Dubois, H. Prade:
Fuzzy Sets and Systems. Academic Press, New York - London - Tokyo 1980.
MR 0589341 |
Zbl 0444.94049
[3] M. Mareš:
How to handle fuzzy-quantities? . Kybernetika 13 (1977), 1, 23 - 40.
MR 0453405
[4] M. Mareš:
Addition of rational fuzzy quantities: convolutive approach. Kybernetika 25 (1989), 1, 1- 12.
MR 0987852