John Michael Rassias, R. Murali, Matina John Rassias, and A.Antony Raj. “General Solution, Stability and Non-Stability of Quattuorvigintic Functional Equation in Multi-Banach Spaces”. International Journal of Mathematics And Its Applications, vol. 5, no. 2 - A, Apr. 2017, pp. 181-94, https://ijmaa.in/index.php/ijmaa/article/view/804.