GÖZEN, M. New Qualitative Outcomes for Ordinary Differential Systems of Second Order. Contemporary Mathematics, [S. l.], v. 4, n. 4, p. 1210–1221, 2023. DOI: 10.37256/cm.4420243045. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/3045. Acesso em: 4 dec. 2024.