VUORINEN, M. On the Iversen-Tsuji theorem quasiregular mappings. MATHEMATICA SCANDINAVICA, [S. l.], v. 41, p. 90–98, 1977. DOI: 10.7146/math.scand.a-11704. Disponível em: https://www.mscand.dk/article/view/11704. Acesso em: 7 may. 2024.