GÖZEN, M. New Qualitative Outcomes for Ordinary Differential Systems of Second Order. Contemporary Mathematics, [S. l.], v. 5, n. 1, 2023. DOI: 10.37256/cm.5120243045. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/3045. Acesso em: 3 dec. 2023.