The Number of Bifurcation Points of a Periodic Ordinary Differential Equation with Cubic Nonlinearities. Nonlinear Studies, [S. l.], v. 8, n. 2, 2001. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/90. Acesso em: 29 nov. 2025.