Existence of Solutions for Fractional Differential Equations with Conformable Fractional Differential Derivatives. Communications in Mathematical Research, [S. l.], v. 35, n. 2, p. 129–138, 2019. DOI: 10.13447/j.1674-5647.2019.02.04. Disponível em: https://global-sci.com/index.php/cmr/article/view/8996. Acesso em: 5 dec. 2025.