Mozel’, V. A. “On a Banach Algebra Generated by the Bergman Operator, Constant coefficients, and Finitely Generated Groups of Shifts”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 11 (November 25, 2017): 1515-1523. Accessed April 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1799.