Nadeem, Muhammad, and Hijaz Ahmad. “Variational Iteration Method for Analytical Solution of the Lane-Emden Type Equation With Singular Initial and Boundary Conditions”. Earthline Journal of Mathematical Sciences 2, no. 1 (May 2, 2019): 127-142. Accessed April 18, 2024. https://earthlinepublishers.com/index.php/ejms/article/view/103.