RUTKAUSKAS, Stasys. On a modified Dirichlet type problem for the elliptic equation degenerating on a line. Lietuvos matematikos rinkinys, [S. l.], v. 40, n. spec., p. 140–145, 2000. DOI: 10.15388/LMR.2000.35081. Disponível em: https://journals.vu.lt./LMR/article/view/35081. Acesso em: 19 apr. 2025.