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, Maryland, USA, v. 18, n. 4, p. 6042, 2025. DOI: 10.29020/nybg.ejpam.v18i4.6042. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/6042. Acesso em: 5 dec. 2025.