Zavorotinskii, A. V. (2014) “On Elliptic Boundary-Value Problems with Small Parameter and Additional Functions on the Boundary of a Domain”, Ukrains’kyi Matematychnyi Zhurnal, 66(9), pp. 1269–1275. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2218 (Accessed: 25April2024).