Nagaraj, Mahalingam, et al. “Approximate Controllability Results for Impulsive Partial Functional Nonlocal Integro-Differential Evolution Systems through Resolvent Operators”. Discontinuity, Nonlinearity, and Complexity, vol. 7, no. 3, Aug. 2026, pp. 305-2, https://doi.org/10.5890/DNC.2018.09.008.