F. S. Fadhel and S. A.-D. M. Jameel, “Variational Iteration Method for Solving Boundary Value Problems of Fractional Order”, Al-Nahrain J. Sci., no. 2, pp. 59–64, Jan. 2019, Accessed: May 22, 2026. [Online]. Available: https://mail.anjs.edu.iq/index.php/anjs/article/view/2055