References
- R. Biswas, Rosenfeld's fuzzy subgroups with interval-valued membership functions, Fuzzy set and systems 63(1995) 87-90.
- M. Cheong and K. Hur, Interval-valued fuzzy ideals and bi-ideals of a semigroup, IJFIS 11(2011), 259-266. https://doi.org/10.5391/IJFIS.2011.11.4.259
- J. Y. Choi, S. R. Kim and , Interval-valued smooth topological spaces, Honam Math.J.32(4)(2010), 711-738. https://doi.org/10.5831/HMJ.2010.32.4.711
- M.B.Gorzalczany, A method of inference in approximate reasoning based on interval-values fuzzy, sets, Fuzzy sets and Systems 21(1987) 1-17. https://doi.org/10.1016/0165-0114(87)90148-5
-
K.Hur, Y.B.Jun and H.S.Kim, On
$\Omega$ -bifuzzy subsemigroups in semigroups, Honam Math. J. 27(1) (2005), 31-41. - K.Hur, J. G. Lee and J. Y. Choi, Interval-valued fuzzy relations, JKIIS 19(3)(2009), 425-432. https://doi.org/10.5391/JKIIS.2009.19.3.425
- H. Kang, Interval-valued fuzzy subgroups and homomorphisms, Honam Math.J.33(4)(2011), 499-518. https://doi.org/10.5831/HMJ.2011.33.4.499
- H. Kang and K.Hur, Interval-valued fuzzy subgroups and rings, Honam Math.J.32(4)(2010), 593-617. https://doi.org/10.5831/HMJ.2010.32.4.593
- K. C. Lee, H. Kang and K.Hur, Interval-valued fuzzy generalized bi-ideals of a semigroup, Honam Math.J.33(4)(2011), 603-611. https://doi.org/10.5831/HMJ.2011.33.4.603
- T.K.mondal and S.K.Samanta, Topology of interval-valued fuzzy sets, Indian J. Pure Appl. Math. 30(1)(1999), 20-38.
- L.A.Zadeh, Fuzzy sets, Inform and Control 8(1965), 338-353. https://doi.org/10.1016/S0019-9958(65)90241-X
- L.A.Zadeh, The concept of a linguistic variable and its application to approximate reasoning-I, Inform. Sci 8(1975), 199-249. https://doi.org/10.1016/0020-0255(75)90036-5