“On existence of a smooth bounded semiinvariant manifold for a degenerate nonlinear system of difference equations in the space $\mathfrak{m}$” (2003) Neliniini Kolyvannya, 6(3), pp. 378–400. Available at: https://nosc.imath.kiev.ua/index.php/nosc/article/view/275 (Accessed: 12 April 2026).