M. Arunkumar, T. Namachivayam, E. Sathya, and P. Sentamil, “Generalized Ulam - Hyers - Rassias Stability of Additive - Quadratic Functional Equation in $(\beta;p)-$ Banach Space”, Int. J. Math. And Appl., vol. 6, no. 3, pp. 315–323, Sep. 2018.