Generic Rank-2 Perturbation of Hamiltonian Systems with Periodic Coefficients. Global Journal of Science Frontier Research, [S. l.], v. 21, n. F1, p. 17–26, 2021. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/2888. Acesso em: 14 aug. 2026.