BENCHOHRA, Mouffak; LAZREG, Jamal E. Existence and Ulam stability for nonlinear implicit fractional differential equations with Hadamard derivative. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 62, n. 1, p. 27–38, 2017. DOI: 10.24193/subbmath.2017.0003. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1689. Acesso em: 5 feb. 2025.