Karthikeyan, P., and K. Keerthivasan. “Existence of Solutions for Mixed Fractional Integro-Differential Equations in Banach Spaces”. Discontinuity, Nonlinearity, and Complexity, vol. 15, no. 3, Aug. 2026, pp. 439-50, https://doi.org/10.5890/DNC.2026.09.011.