[1]
Bhavin Mansukhlal Patel, “On the Stability of the Quadratic Functional Equation $f(2x+y) + f(x+2y)$ $= 4f(x+y) + f(x) + f(y)$ in $2$-Banach Space”, Int. J. Math. And Appl., vol. 13, no. 4, pp. 41–53, Jan. 2026.