SIERRA, W. John surfaces associated with a class of harmonic mappings. Annales Fennici Mathematici, [S. l.], v. 38, n. 2, p. 595–616, 2013. DOI: 10.5186/aasfm.2013.3844. Disponível em: https://afm.journal.fi/article/view/135454. Acesso em: 22 nov. 2024.