EFENDIEV, M. A.; WENDLAND, W. L. Nonlinear Riemann-Hilbert problems for doubly connected domains and closed boundary data. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 1, p. 111–124, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.007. Acesso em: 20 apr. 2024.