BENDRICI, Nadhir; BOUTIARA, Abdellatif; BOUMEDIEN-ZIDANI, Malika. Existence theory for $\psi$-Caputo fractional differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 9, p. 1291–1303, 2025. DOI: 10.3842/umzh.v76i9.7669. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7669. Acesso em: 8 dec. 2025.