Ullah, M Wali, M Alhaz Uddin, and M Saifur Rahman. “An Analytical Technique for Handling Forced Van Der Pol Vibration Equation”. Journal of Bangladesh Academy of Sciences 45, no. 2 (January 26, 2022): 231–240. Accessed June 30, 2024. https://banglajol.info/index.php/JBAS/article/view/56654.