Dey, K. K., and A. C. Paul. “On a Pair of (σ, Τ)-Derivations of Semiprime Γ-Rings”. Journal of Scientific Research 3, no. 3 (August 28, 2011): 515–524. Accessed September 21, 2024. https://www.banglajol.info/index.php/JSR/article/view/7659.