HUDAIGULYEV, B. A. Elliptic equation with singular potential. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 12, p. 1715 – 1723, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2994. Acesso em: 7 apr. 2025.