MARTIO, O.; SREBRO, U. Locally injective automorphic mappings in $R^n$. Mathematica Scandinavica, Berkeley, CA, United States, v. 85, n. 1, p. 49–70, 1999. DOI: 10.7146/math.scand.a-13884. Disponível em: https://journals.msp.org/mscand/article/view/944. Acesso em: 24 jul. 2026.