A. Kaufmann and M. M. Gupta, Introduction to Fuzzy Arithmetic Theory and Application, Van
Nostrand Reinhold, New York, 1991.
G. J. Klir and T. A. Folger, Fuzzy Sets, Uncertainty, and Information, Prentice Hall,
Englewood Cliffs, NJ, 1988.
G. J. Klir and Bo Yuan, Fuzzy Sets and Fuzzy Logic: Theory and Applications, Prentice
Hall, Upper Saddle River, NJ, 1995.
G. J. Klir, Ute H. St. Clair, and Bo Yuan, Fuzzy Set Theory, Prentice Hall, Upper Saddle
River, NJ, 1997.
T. J. Ross, Fuzzy Logic with Engineering Applications, McGraw-Hill, Hightstown, NJ,
M. S. Stachowicz and M. E. Kochanska, Graphic interpretation of fuzzy sets and fuzzy relations,
Mathematics at the Service of Man, Edited by A. Ballester, D. Cardus, and E. Trillas, based on
materials of Second World Conf., Universidad Politecnica Las Palmas, Spain, 1982.
H. J. Zimmermann, Fuzzy Set Theory and Its Applications, 3rd ed., Kluwer Academic
Publishers, Boston, MA, 1996.