SukhorolskyiM. A. “Domain of Convergence of the Euler Transform for the Power Series of an Analytic Function”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, no. 8, Aug. 2008, pp. 1144–1152, https://umj.imath.kiev.ua/index.php/umj/article/view/3232.