Hasan, MM, and MA Matin. “Approximate Solution of Nonlinear Integral Equations of the Second Kind by Using Homotopy Perturbation Method”. Dhaka University Journal of Science 65, no. 2 (July 5, 2017): 151–155. Accessed September 27, 2024. https://banglajol.info/index.php/DUJS/article/view/54527.