MARDANOV , I. Dzh. Existence of the solution family of a system of linear difference equations with an argument deviation . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 7, p. 988–991, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8132. Acesso em: 6 dec. 2025.