BurskiiV. P. “On the Uniqueness of Solutions to Some Boundary-Value Problems for Differential Equations in a Domain With Algebraic Boundary”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 7 (July 25, 1993): 898–906. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5882.