“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” (2002) Neliniini Kolyvannya, 5(3), pp. 380–386. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/228 (Accessed: 22 January 2026).