PRYKARPATSKY, A. K.; SAMOILENKO, A. M.; SAMOILENKO, V. G. Lyapunov–Schmidt Approach to Studying Homoclinic Splitting in Weakly Perturbed Lagrangian and Hamiltonian Systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 1, p. 66–74, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3888. Acesso em: 6 dec. 2025.