I. Khaleel, Omar. “Variational Iteration Method for Solving Multi-Fractional Integro Differential Equations”. Iraqi Journal of Science 55, no. 3A (October 22, 2023): 1086–1094. Accessed December 17, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11396.