Existence of solutions to a coupled system of implicit fractional differential equations with nonlocal boundary conditions. Nonlinear Studies, [S. l.], v. 32, n. 4, p. 1165–1187, 2025. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/3301. Acesso em: 13 jan. 2026.