MARTIO, O.; SREBRO, U.; VÄISÄLÄ, J. Normal families, multiplicity and the branch set of quasiregular maps. Annales Fennici Mathematici, [S. l.], v. 24, n. 1, p. 231–252, 1999. Disponível em: https://afm.journal.fi/article/view/134952. Acesso em: 19 may. 2024.