PLOTNIKOV, A. V.; TUMBRUKAKI, A. V. Integro-differential equations with multivalued solutions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 3, p. 359–367, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4426. Acesso em: 14 apr. 2025.