“Existence and Stability Results of Relaxation Fractional Differential Equations With Hilfer--Katugampola Fractional Derivative”. Advances in the Theory of Nonlinear Analysis and its Application 4, no. 4 (August 25, 2023): 299–315. Accessed May 10, 2026. https://atnaea.org/index.php/journal/article/view/138.