“Fifth Order Improved Runge-Kutta Nystrom Method Using Trigonometrically-Fitting for Solving Oscillatory Problems”. Al-Nahrain Journal of Science 25, no. 4 (December 31, 2022): 63–67. Accessed December 23, 2024. https://mail.anjs.edu.iq/index.php/anjs/article/view/2517.