Cartan’s Approach to Second Order Ordinary Differential Equations. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 13, n. 4, p. 1016–1034, 2020. DOI: 10.29020/nybg.ejpam.v13i4.3868. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3868. Acesso em: 22 dec. 2024.