KRUGLOV, V. E. Construction of a fundamental system of solutions of a linear finite-order difference equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 6, p. 777–794, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3058. Acesso em: 6 dec. 2025.