S.K.Sardar, S. , B.Davvaz, B. , S.Kayal, S. , S.K.Majumdar, S.. "A Note on Characterization of Regular Γ-Semigroups in terms of (∈,∈ ∨q)-Fuzzy Bi-ideal". World Academy of Science, Engineering and Technology, Open Science Index 52, International Journal of Mathematical and Computational Sciences (2011), 5(4), 703 - 706.