“Necessary and sufficient conditions for the nonlinear difference operator $(Dx)(t) = x(t + 1) - f(x(t))$ to be invertible in the space of functions bounded and continuous on the axis”, НК, vol. 5, no. 3, pp. 380–386, Sep. 2002, Accessed: Jan. 22, 2026. [Online]. Available: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/228