Karelin, O., and A. A. Tarasenko. “Conditions of Invertibility for Functional Operators With Shift in Weighted Hölder Spaces”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, no. 11, Nov. 2015, pp. 1557-68, https://umj.imath.kiev.ua/index.php/umj/article/view/2089.