Chakraborty, Sujoy, and Akhil Chandra Paul. “The K-Derivation Acting As a K-Endomorphism and As an Anti-K-Endomorphism on Semiprime Nobusawa Gamma Ring”. GANIT: Journal of Bangladesh Mathematical Society, vol. 33, Jan. 2014, pp. 93-101, doi:10.3329/ganit.v33i0.17663.