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Generalized Ulam-Hyers Stability of a General Mixed AQCQ-functional Equation in Multi-Banach Spaces: a Fixed Point Approach.
Eur. J. Pure Appl. Math.
2010;3(6):1032-1047. Accessed February 24, 2026.
https://www.ejpam.com/ejpam/article/view/854