Rafayelyan, S. G., and A. M. Jerbashian. “On Unitary Operators in Weighted Spaces $A^2_\omega(\mathbb{C})$ of Entire Functions”. Methods of Functional Analysis and Topology, vol. 14, no. 4, Dec. 2008, pp. 380-5, https://zen.imath.kiev.ua/index.php/mfat/article/view/401.