MUAYYAD MAHMOOD KHALIL. On a unique solution of fractional differential system. Tikrit Journal of Pure Science, [S. l.], v. 24, n. 3, p. 128–132, 2019. DOI: 10.25130/tjps.v24i3.381. Disponível em: https://tjpsj.org/index.php/tjps/article/view/381. Acesso em: 17 jun. 2025.