[1] G. Bortolan and R. Degani, A review of some methods for ranking fuzzy subsets, Fuzzy Sets
and Systems, 15 (1985), 1-19.
[2] H. Bustince, Indicator of inclusion grade for interval-valued fuzzy sets: Application to ap-
proximate reasoning based on interval-valued fuzzy sets, Int. J. Approximate Reasoning, 23
(2000), 137-209.
[3] P. T. Chang and E. S. Lee, Fuzzy arithmetic and comparison of fuzzy numbers, In: M.
Delgado, J. Kacprzyk (Eds.), Fuzzy Optimization, Physica-Verlag, Heidelberg, (1994), 69-82.
[4] P. Diamond and P. Kloeden, Metric Spaces of Fuzzy Sets: Theory and Applications, World
Scienti c, Singapore, 1994.
[5] J-x. Fang and H. Huang, On the level convergence of a sequence of fuzzy numbers, Fuzzy
Sets and Systems, 147 (2004), 417-435.
[6] P. Grzegorzewski, Metrics and orders in space of fuzzy numbers, Fuzzy Sets and Systems, 97
(1998), 83-94.
[7] S. Heilpern, Comparison of fuzzy numbers in decision making, Tatra Mountains Math. Publ.,
6 (1995), 47-53.
[8] M. Mizumoto and K. Tanaka, Some properties of fuzzy numbers, In: M. M. Gupta et al.
(Eds.) , Advances in Fuzzy Set Theory and Applications, North Holland, (1979), 153-164.
[9] R. E. Moore, Interval Analysis, Prentice-Hall, N.J., 1966.
[10] M. L. Puri and D. A. Ralescu, Fuzzy random variables, J. Math. Anal. Appl., 114 (1986),
409-422.
[11] Q. Zhu and E. S. Lee, Comparison and ranking of fuzzy numbers, in: J. Kacprzyk, M. Fedrizzi
(Eds.), Fuzzy Regression Analysis, Omnitech Press, Warsaw, (1992), 21-44.
)