Cao Chun . FUZZY APPROACHING SET AND FUZZY APPROACHING FUNCTIONAL MAPPING. Applied Mathematics and Mechanics (English Edition), 1998, 19(11): 1083-1093.
[1] E.W.Cherney, An Introduction to the Theory of Approximation, translated by Xu Xianyu, et al., Shanghai Science and Technology Press, Shanghai (1981).(Chinese version)
[2] Li Senlin and Wen Lizhi, Functional Differential Equations, Hunan Science and Technology Press, Changsha (1987).(in Chinese)
[3] Wong Peizhuang.Theory of Fuzzy Set and Its Applications, Shanghai Science and Technology Press, Shanghai (1983).(in Chinese)
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