GADJIEV, T.; KERIMOVA, M.; GASANOVA, G. Solvability of a boundary-value problem for degenerate equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 4, p. 435–451, 2020. DOI: 10.37863/umzh.v72i4.6000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6000. Acesso em: 5 dec. 2025.