Zvozdetskyi, T.I. 2012. “On the $n$-Similarity of the Operators Which Are Left Inverse to the $n^{th}$ Degree of the Integration Operator in the Spaces of Analytic Functions”. Carpathian Mathematical Publications 4 (2):261-67. https://vps.pnu.edu.ua/index.php/cmp/article/view/2270.