1. Fuzzy multiplication semigroup
2. J.M. Howie, Fundamentals of semigroup theory, London Mathematical Society Monographs. New Series, 12. Oxford Science Publications. The Clarendon Press, Oxford University Press, New York, 1995.
3. J.Kim, Some Fuzzy semiprime ideals of semigroup, Journal of the Chungcheong Mathematical Soc. 22(3)(2009) 459–466.
4. Fuzzy prime spectrum of a ring II
5. Fuzzy prime spectrum of a ring