R. Murali, and V. Vithya. “Generalized Hyers-Ulam Stability of an Additive Functional Equation”. International Journal of Mathematics And its Applications 6, no. 1 (Special Issue) (May 1, 2018): 55–59. Accessed November 26, 2025. http://ijmaa.in/index.php/ijmaa/article/view/1395.