“Fifth Order Improved Runge-Kutta Nystrom Method Using Trigonometrically-Fitting for Solving Oscillatory Problems”, ANJS, vol. 25, no. 4, pp. 63–67, Dec. 2022, Accessed: May 20, 2024. [Online]. Available: https://anjs.edu.iq/index.php/anjs/article/view/2517