A. Alshikh, Abdelbagy, and Mohand M. Abdelrahim Mahgoub. “Solving Ordinary Differential Equations With Variable Coefficients”. Journal of Progressive Research in Mathematics 10, no. 1 (December 1, 2016): 1454-1459. Accessed April 19, 2024. http://scitecresearch.com/journals/index.php/jprm/article/view/949.