MATTILA, Pertti. Measures with unique tangent measures in metric groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 97, n. 2, p. 298–308, 2005. DOI: 10.7146/math.scand.a-14977. Disponível em: https://journals.msp.org/mscand/article/view/720. Acesso em: 24 jul. 2026.