An Essential Extension of the Finite-Energy Condition for Extended Runge-Kutta-Nyström Integrators when Applied to Nonlinear Wave Equations. Communications in Computational Physics, [S. l.], v. 22, n. 3, p. 742–764, 2017. DOI: 10.4208/cicp.OA-2016-0141. Disponível em: https://www.global-sci.com/index.php/cicp/article/view/6481. Acesso em: 5 dec. 2025.