NEAMATY, A.; KAFFAEI, P.A. Existence of tube solution for a fractional initial value problem. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 42, p. 703–714, 2019. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7197. Acesso em: 27 oct. 2026.