“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): 380-86. https://twinhead.imath.kiev.ua/index.php/nosc/article/view/228.