“A Result on Approximate Controllability Results for Fractional Neutral Integro-Differential Equations With Nonlocal and Finite Delay Conditions in Hilbert Spaces”. Nonlinear Studies 25, no. 1 (February 25, 2018). Accessed September 16, 2025. https://nonlinearstudies.com/index.php/nonlinear/article/view/1656.