HUDSON, Sigmund N. A Note on Invariant Uniformities in Coset Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 12, p. 36–38, 1963. DOI: 10.7146/math.scand.a-10670. Disponível em: https://journals.msp.org/mscand/article/view/2652. Acesso em: 25 jul. 2026.