Gol'dberg, A. A. “Uniqueness Theorems for Algebraic Functions That Take the Number of Algebraic Elements into Account”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 11 (November 25, 1995): 1498–1505. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5540.