BRZYCHCZY, S.; PRYKARPATSKY, A. K.; SAMOILENKO, V. G. Finite-Dimensional Reductions of Conservative Dynamical Systems and Numerical Analysis. I. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 2, p. 220–228, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4237. Acesso em: 14 apr. 2025.