Functional Equations, Inequalities and Applications
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[6] George Isac and Themistocles M. Rassias: “On the Hyers—Ulam stability of up -additive mappings', J. Approx. Theory 72 (2) (1993), 131–137. [7] George Isac and Themistocles M. Rassias: 'Stability of p-additive mappings: applications to ...