Existence and uniqueness of solutions for the nonlinear retarded and advanced implicit Hadamard fractional differential equations with nonlocal conditions. Nonlinear Studies, [S. l.], v. 27, n. 2, 2020. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/1978. Acesso em: 18 sep. 2025.