Mokhonko, A. Z., and A. A. Mokhonko. “On the Order of Growth of the Solutions of Linear Differential Equations in the Vicinity of a Branching Point”.
Ukrains’kyi Matematychnyi Zhurnal 67, no. 1 (January 25, 2015): 139–144. Accessed April 26, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/1969.