S. Murthy, M. Arunkumar, and V. Govindan. 2016. “General Solution and Generalized Hyers-Ulam Stability of N-Dimensional Cubic Functional Equation in Various Normed Space: Direct and Fixed Point Methods”. International Journal of Mathematics And Its Applications 4 (1 - D):81-109. http://ijmaa.in/index.php/ijmaa/article/view/395.