KURBANSHOEV , S. Z. Construction and analytical properties of integral varieties of solutions of a system of nonlinear difference equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 5, p. 630–636, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7958. Acesso em: 6 dec. 2025.