M. Arunkumar, E. Sathya, and T. Namachivayam. “Solution and Stability of a Functional Equation Originating From Consecutive Terms of a Geometric Progression”. International Journal of Mathematics And Its Applications, vol. 4, no. 4 (Special Issue), Dec. 2016, pp. 33-42, http://ijmaa.in/index.php/ijmaa/article/view/1418.