Multiple Positive Solutions for a coupled system of Sturm-Liouville Fractional Order Two-point Boundary Value Probles. Nonlinear Studies, [S. l.], v. 20, n. 4, 2013. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/848. Acesso em: 9 nov. 2025.