Syrovatskyi, V.N. “About Functional Models of Commutative Systems of Operators in the Spaces of De Branges”. Reports of the National Academy of Sciences of Ukraine, no. 4 (July 1, 2024): 7–11. Accessed April 18, 2026. https://nasu-periodicals.org.ua/index.php/dp/article/view/5396.