Analysis of impulsive psi-Hilfer fractional integro- differential system. Nonlinear Studies, [S. l.], v. 32, n. 4, p. 1361–1372, 2025. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/4143. Acesso em: 3 feb. 2026.