LAINE, I. Covering properties of harmonic Bl-mappings III. Annales Fennici Mathematici, [S. l.], v. 1, n. 2, p. 309–325, 1975. DOI: 10.5186/aasfm.1975.0108. Disponível em: https://afm.journal.fi/article/view/134263. Acesso em: 14 apr. 2025.