SHCHEGOLEV, S. A. On solutions of a quasilinear almost triangular system of difference equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 4, p. 525–530, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5451. Acesso em: 6 dec. 2025.