“Homotopy Perturbation Method With Modified Riemann –Liouville Derivative for Solving Fractional- Time Partial Differential Equations ”. University of Thi-Qar Journal of Science 3, no. 2 (February 12, 2012): 163–173. Accessed December 26, 2024. http://mail.jsci.utq.edu.iq/index.php/main/article/view/395.