SAMOILENKO, M. V.; TEPLINSKY, Yu. V. On periodic solutions of countable systems of linear and quasilinear difference equations with periodic coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 8, p. 1144–1152, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5258. Acesso em: 14 apr. 2025.