MARTYNYUK, D. I.; PERESTYUK, N. A.; SAMOILENKO, A. M. Reducibility of nonlinear almost periodic systems of difference equations given on a torus. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 4, p. 404–410, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5737. Acesso em: 16 dec. 2025.