VALDES, J. E. N.; BITTENCURT, L. M. L. M. A Note on Bounded Solutions of a Generalized Lienard Type System. American Scientific Research Journal for Engineering, Technology, and Sciences, [S. l.], v. 17, n. 1, p. 89–94, 2016. Disponível em: https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1155. Acesso em: 3 may. 2024.