Studying The Necessary Optimality Conditions and Approximates a Class of Sum Two Caputo–Katugampola Derivatives for FOCPs. Iraqi Journal of Science [Internet]. 2023 Feb. 28 [cited 2024 May 8];64(2):842-54. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/7017