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John M. Rassias, M. Arunkumar, P. Agilan. Solution and Ulam - Hyers Stability of an Additive - Quadratic Functional Equation in Banach Space: Hyers Direct and Fixed Point Methods. Int. J. Math. And Appl. [Internet]. 2015 Dec. 25 [cited 2024 May 13];3(4 - D):17-46. Available from: http://ijmaa.in/index.php/ijmaa/article/view/512