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