On Fuzzy Bi-ideals and Fuzzy Quasi Ideals in Gamma-Semigroups
  The purpose of this paper is to investigate some properties of fuzzy ideals and fuzzy bi-ideals in gamma-semigroups and to introduce the notion of fuzzy quasi ideals in gamma-semigroups. Here we also characterize a regular gamma-semigroup in terms of fuzzy quasi ideals. 
Sujit Kumar Sardar, Samit Kumar Majumder, Soumitra Kayal
math.GM