Rabiei, F. , Ismail, F. , Norazak, S. , Emadi, S. (2012), 'Numerical Solution of Second-Order Ordinary Differential Equations by Improved Runge-Kutta Nystrom Method', World Academy of Science, Engineering and Technology, Open Science Index 69, International Journal of Mathematical and Computational Sciences, 6(9), 1372 - 1375.