KOMLEVA, T. A.; PLOTNIKOV, A. V.; PLOTNIKOVA, L. I. One multivalued discrete system and its properties. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 11, p. 1519–1524, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1655. Acesso em: 17 apr. 2025.