참고문헌
- R. Badard, “Smooth axiomatics”, First IFSA Congress, Palma de Mallorca, July 1986.
- C. L. Chang, "Fuzzy topological spaces", J. Math. Anal. Appl., Vol. 24, pp. 182-190, 1968. https://doi.org/10.1016/0022-247X(68)90057-7
- A. A. Ramadan, "Smooth topological spaces", Fuzzy Sets and Systems, Vol. 48, pp. 371-375, 1992. https://doi.org/10.1016/0165-0114(92)90352-5
- L. A. Zadeh, "Fuzzy sets", Inform. and Control,Vol. 8, pp. 338-353, 1965. https://doi.org/10.1016/S0019-9958(65)90241-X