VITYUK, A. N. On the existence of solutions for a differential inclusion of fractional order with upper-semicontinuous right-hand side. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 11, p. 1562–1565, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4757. Acesso em: 6 dec. 2025.