Abdo, Mohammed S., Satish K. Panchal, and Hussien Shafei Hussien. 2019. “Fractional Integro-Differential Equations With Nonlocal Conditions and ψ–Hilfer Fractional Derivative”. Mathematical Modelling and Analysis 24 (4):564-84. https://doi.org/10.3846/mma.2019.034.