Rami Al-Ahmad, M. Al-Jararha, and H. Al Mefleh. “Exactness of Second Order Ordinary Differential Equations and Integrating Factors”. Jordan Journal of Mathematics and Statistics 8, no. 2 (May 18, 2025): 155–167. Accessed October 9, 2025. https://jjms.yu.edu.jo/index.php/jjms/article/view/1064.