Zagorodnyuk, A. V., and Z. H. Mozhyrovska. “Hypercyclic Composition Operators on Hilbert Spaces of Analytic Functions”. Methods of Functional Analysis and Topology, vol. 20, no. 3, Sept. 2014, pp. 284-91, https://zen.imath.kiev.ua/index.php/mfat/article/view/584.