Dey, K. K., and A. C. Paul. “On the Trace of a Permuting Tri-Additive Mapping in Left s<sub>&gamma;</Sub>-Unital &Gamma;-Rings”. Journal of Scientific Research 3, no. 2 (April 28, 2011): 331–337. Accessed July 16, 2024. https://banglajol.info/index.php/JSR/article/view/7278.