[1] P.W. Cholewa, Remarks on the stability of functional equations, Aequationes Math. 27 (1984), 76–86.
[2] S. Czerwik, On the stability of the quadratic mapping in normed spaces, Abh. Math. Semin. Univ. Hambg. 62 (1992), 59–64.
[3] S. Czerwik and K. Dlutek, Stability of the quadratic functional equation in Lipschitz spaces, J. Math. Anal. Appl. 293 (2004), 79–88.
[4] A. Ebadian, I. Nikoufar, Th.M. Rassias, and N. Ghobadipour, Stability of generalized derivations on Hilbert C∗-modules associated to a Pexiderized Cauchy-Jensen type functional equation, Acta Math. Sci. 32B (2012), 1226–1238.
[5] S.-M. Jung and P.K. Sahoo, Hyers-Ulam stability of the quadratic equation of Pexider type, J. Korean Math. Soc. 38 (2001), 645–656.
[6] S. Ghaffary Ghaleh and K. Ghasemi, Hyers-Ulam-Rassias stability of n-Jordan ∗-homomorphisms on C∗-algebras, Bull. Iranian Math. Soc. 39 (2013), 347–353.
[7] M.E. Gordji, n-Jordan homomorphisms, Bull. Austral. Math. Soc. 80 (2009), 159–164.
[8] M.E. Gordji, A. Jabbari, and E. Kapapinar, Automatic continuity of surjective n-homomorphisms on Banach algebras, Bull. Iran. Math. Soc. 41 (2015), 1207–1211.
[9] M.E. Gordji, T. Karimi, and S.K. Gharetapeh, Approximately n-Jordan homomorphisms on Banach algebras, J. Ineq. Appl. 870843 (2009).
[10] H. Khodaei and Th.M. Rassias, Approximately generalized additive functions in several variables, Int. J. Nonlinear Anal. Appl. 1 (2010), 22–41.
[11] H. Khodaei, Asymptotic behavior of n-Jordan homomorphisms, Mediterr. J. Math. 17, 143 (2020).
[12] J.R. Lee, S.-Y. Jang, C. Park, and D.Y. Shin, Fuzzy stability of quadratic functional equations, Adv. Difference Equ. 2010 (2010), Article ID 412160, 16 pages.
[13] J.B. Diaz and B. Margolis, A fixed point theorem of the alternative for contractions on a generalized complete metric space, Bull. Amer. Math. Soc. 74 (1968), 305–309.
[14] M.S. Moslehian, K. Nikodem, and D. Popa, Asymptotic aspect of the quadratic functional equation in multi-normed spaces, J. Math. Anal. Appl. 355 (2009), 717–724.
[15] I. Nikoufar, Jordan (θ, ϕ)-derivations on Hilbert C∗-modules, Indag. Math. (N.S.) 26 (2015), 421–430.
[16] I. Nikoufar, Refined almost double derivations and Lie ∗-double derivations, Miskolc Math. Notes 16 (2015), 1063–1071.
[17] I. Nikoufar, Lipschitz criteria for bi-quadratic functional equations, Commun. Korean Math. Soc. 31 (2016), 819–825.
[18] I. Nikoufar, Approximate tri-quadratic functional equations via Lipschitz conditions, Math. Bohemica 142 (2017), 337–344.
[19] I. Nikoufar, Stability of multi-quadratic functions in Lipschitz spaces, Iran J. Sci. Tech. 43 (2019), 621–625.
[20] C. Park, On the stability of the quadratic mapping in Banach modules, J. Math. Anal. Appl. 276 (2002), 135–144.
[21] F. Skof, Local properties and approximations of operators, Rend. Sem. Mat. Fis. Milano 53 (1983), 113–129.