KALITA, E. A. On the order of isolated singularities of solutions to elliptic systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 10, p. 1349–1358, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8231. Acesso em: 5 dec. 2025.