OstrovskiiI. V. “M. G. Krein’s Investigations in the Theory of Entire and Meromorphic Functions and Their Further Development”. Ukrains’kyi Matematychnyi Zhurnal 46, no. 1-2 (February 25, 1994): 87–99. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5772.