Savchuk, V. V. “On the Mean-Value Theorem for Analytic Functions”.
Ukrains’kyi Matematychnyi Zhurnal
49, no. 8 (August 25, 1997): 1143–1147. Accessed April 14, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/5108
.