LITOVCHENKO, V. A. Cauchy problem with Riesz operator of fractional differentiation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 12, p. 1653–1667, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3716. Acesso em: 5 dec. 2025.