Bounded positive solutions of nonlinear fourth-order iterative differential equations with integral and multi-point boundary conditions. Nonlinear Studies, [S. l.], v. 31, n. 4, p. 1309–1320, 2024. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/3397. Acesso em: 23 jul. 2026.