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Ragula, K. and Soujanya, G.B.S.L. 2026. Numerical Scheme for Singularly Perturbed Differential Equations with Small Shifts Using Non-Polynomial Quartic Spline. Bulletin of the Karaganda University. Mathematics Series. 121, 1 (Mar. 2026), 217–227. DOI:https://doi.org/10.31489/2026m1/217-227.