SAMOILENKO, A. M.; TEPLINSKY, Yu. V. On the reducibility of countable systems of linear difference equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 11, p. 1533–1541, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5544. Acesso em: 14 apr. 2025.