PARDO, R. Bifurcation for an elliptic problem with nonlinear boundary conditions. Revista Integración, temas de matemáticas, [S. l.], v. 30, n. 2, p. 151–226, 2012. Disponível em: https://revistas.uis.edu.co/index.php/revistaintegracion/article/view/2903. Acesso em: 22 jul. 2024.