L. N. M. Tawfiq and H. W. Rasheed, “On Solution of Nonlinear Singular Boundary Value Problem”, IHJPAS, vol. 26, no. 3, pp. 331–339, Apr. 2017, Accessed: Mar. 29, 2025. [Online]. Available: https://jih.uobaghdad.edu.iq/index.php/j/article/view/444