[1] Alizadeh, Z., & Ghazanfari, A. G. (2016). On the stability of a radical cubic functional equation in quasi β-spaces. Journal of Fixed Point Theory and Applications, 18, 843–853. https://doi.org/10.1007/s11784-016-0317-9
[2] Aoki, T. (1950). On the stability of the linear transformation in Banach spaces. Journal of the Mathematical Society of Japan, 2, 64–66.
[3] Dubois, D., & Prade, H. (2007). Gradual elements in a fuzzy set. Soft Computing-A Fusion of Foun dations, Methodologies and Applications, 12, 165-175.
[4] Forti, G. (1995). Hyers-Ulam stability of functional equations in several variables. Aequationes Mathematicae, 50, 143–190.
[5] Fortin, J., Dubois, D., & Prade, H. (2008). Gradual numbers and their application to fuzzy interval analysis. IEEE Transactions on Fuzzy Systems, 16, 388-402.
[6] Gavruta, P. A. (1994). Generalization of the Hyers-Ulam-Rassias stability of approximately additive mappings. Journal of Mathematical Analysis and Applications, 184, 431–436.
[7] Jung, S. M. (2004). Hyers-Ulam-Rassias Stability of Functional Equations in Nonlinear Analysis. Springer Science Business Media.
[8] Jung Rye, L., Park, C., & Rassias, Th. M. (2023). Hyers–Ulam–Rassias stability of functional equations in G-normed spaces. In Analysis, Geometry, Nonlinear Optimization and Applications (pp. 589-598).
[9] Khan, K. A. (2014). Generalized normed spaces and fixed point theorems. Journal of Mathematical and Computational Science, 13, 157-167.
[10] Modarres Mosadegh, S. M. S., & Movahednia, E. (2018). Stability of preserving lattice cubic functional equation in Menger probabilistic normed Riesz spaces. Journal of Fixed Point Theory and Applications, 20, 34-43.
[11] Movahednia, E., & Mursaleen, M. (2016). Stability of a generalized quadratic functional equation in intuitionistic fuzzy 2-normed space. Filomat, 30(2), 449–457.
[12] Movahednia, E., & Sen, M. D. L. (2023). A new approach to involution in fuzzy C ⋆ -algebra via functional inequality and Python implementation. Axioms, 12(5), 435.
[13] Mursaleen, M., & Mohiuddine, S. A. (2009). On stability of a cubic functional equation in intuitionistic fuzzy normed spaces. Chaos, Solitons & Fractals, 42(5), 2997-3005.
[14] Park, C. (2003). Hyers-Ulam stability of a Pexiderized trigonometric functional equation. Journal of Mathematical Analysis and Applications, 281, 209–218.
[15] Park, C., Eshaghi Gorgji, M., & Saadati, R. (2012). Random homomorphisms and random derivations in random normed algebras via fixed point method. Journal of Inequalities and Applications, 13, 1-4.
[16] Park, C., Movahednia, E., Mosadegh, S. M. S. M., & Mursaleen, M. (2018). Riesz fuzzy normed spaces and stability of a lattice preserving functional equation. Jour. Comput. Anal. Appl., 24(3), 569–579.
[17] Radu, V. (2003). The fixed point alternative and the stability of functional equations. Fixed Point Theory, 4, 91–96.
[18] Rassias, Th. M. (1978). On the stability of the linear mapping in Banach spaces. Proceedings of the American Mathematical Society, 72, 297–300.
[19] Riesz, F. (1930). Sur la decomposition des operations fonctionnelles lineaires. Atti del Congresso Internazionale dei Matematici, 3, 143–148.

[20] Sadeqi, I., & Azari, F. Y. (2011). Gradual normed linear space. Iranian Journal of Fuzzy Systems, 8(5), 131-139.
[21] Salehi, N., & Modarres, S. M. S. (2020). A fixed point method for stability of involutions on multi Banach algebra. Journal of Fixed Point Theory and Applications, 22, 20.
[22] Ulam, S. M. (2004). Problems in Modern Mathematics. Courier Corporation.
[23] Zaanen, A. C. (2012). Introduction to Operator Theory in Riesz Spaces. Springer Science and Business Media.