Zmorovich, V. A. “On Star-Boundaries and Univalence of Some Classes of Functions, Regular in the Circle $|z|”. Ukrains’kyi Matematychnyi Zhurnal 18, no. 3 (April 27, 1966): 28–39. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8734.