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Bhavin Mansukhlal Patel 2026. 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. International Journal of Mathematics And its Applications. 13, 4 (Jan. 2026), 41–53.