“Invertibility conditions for the nonlinear difference operator $(Dx)(n) = x(n+1) - f(x(n))$ in the space $l_{\infty}({\mathbb{Z}},\mathbb{R})$” (2006) Neliniini Kolyvannya, 9(2), pp. 244–263. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/395 (Accessed: 21 January 2026).