KalitaE. A. “On the Order of Isolated Singularities of Solutions to Elliptic Systems”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 10 (October 1, 1992): 1349-1358. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8231.