HERNÁNDEZ, G. E. Behavior of multiple solutions for systems of semilinear elliptic equations. CUBO, A Mathematical Journal, [S. l.], n. 11, p. 59–72, 1995. Disponível em: https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/1816. Acesso em: 17 may. 2024.