Existence of solutions for Nonlinear Caputo-Fabrizio fractional differential equations. Nonlinear Studies, [S. l.], v. 31, n. 4, p. 1081–1095, 2024. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/3769. Acesso em: 1 nov. 2025.