G. Yagachitradevi, S. Lakshminarayanan, P. Ravindiran. Generalized Hyers-Ulam stability of a 3D additive-quadratic functional equation in Banach spaces: A study with counterexamples. Malaya J. Mat. [Internet]. 2023 Oct. 1 [cited 2024 Nov. 21];11(04):417-46. Available from: https://www.malayajournal.org/index.php/mjm/article/view/1971