Baskakov, A. G. “On the Decomposition of a Perturbed Operator of Weighted Shift”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 2 (February 25, 1998): 155–161. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4950.