NÁPOLES VALDÉS, J. E. A Continuation Result for a Bidimensional System of Differential Equations. Revista Integración, temas de matemáticas, [S. l.], v. 13, n. 2, p. 49–54, 1995. Disponível em: https://revistas.uis.edu.co/index.php/revistaintegracion/article/view/999. Acesso em: 3 may. 2024.