John M. Rassias, Matina J. Rassias, M. Arunkumar, and E. Sathya. “$\alpha-$Cubic and $\beta-$Cubic Functional Equations”. International Journal of Mathematics And Its Applications, vol. 5, no. 3 - C, Sept. 2017, pp. 215-31, http://ijmaa.in/index.php/ijmaa/article/view/869.