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Existence of Solutions and Hyers-Ulam Stability for a Coupled System of Nonlinear Langevin Equations Involving φ-Riemann-Liouville and ψ-Caputo Fractional Derivatives Subject to Mixed Boundary Conditions. GJOM 2025, 20 (2), 489-508. https://doi.org/10.56947/gjom.v20i2.3279.