SHAKH , L. G. On the approximation condition of continuity for the fractional derivative . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 12, p. 1719–1722, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8198. Acesso em: 5 dec. 2025.