VITYUK, A. N. Solvability of a Three-Point Boundary-Value Problem for a Second-Order Differential Inclusion. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 1, p. 132–137, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3895. Acesso em: 6 dec. 2025.