“A Novel Explicit Two-Derivative Runge–Kutta–Nyström Method With Energy Conservation for the Integration of Second-Order Periodic ODEs”. European Journal of Pure and Applied Mathematics 18, no. 4 (November 5, 2025): 6042. Accessed December 5, 2025. https://www.ejpam.com/index.php/ejpam/article/view/6042.