REFERENCES
- Angelov P. International Journal of Intelligent Systems (in press).
- Filev D., Yager R. (1991) International Journal of Intelligent Systems, 6, 687–697.
- Georgiev A., Nenov R., Petrov M. (1992) Bioautomation, 12, 56–62.
- Zimmermann H.J. (1983) Computers and Operation Research, 10, 291–298.
- Zimmermann H.J. (1991) Fuzzy set theory and its application, 2nd rev. ed. Kluwer, Boston.