Existence of minimal and maximal solutions for a quasilinear fourth order impulsive differential equation with integral boundary conditions. Nonlinear Studies, [S. l.], v. 28, n. 2, 2021. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/1984. Acesso em: 14 oct. 2025.