CHRISTENSEN, Jens Peter Reus. On Some Measures Analogous to Haar Measure. Mathematica Scandinavica, Berkeley, CA, United States, v. 26, p. 103–106, 1970. DOI: 10.7146/math.scand.a-10969. Disponível em: https://journals.msp.org/mscand/article/view/2357. Acesso em: 25 jul. 2026.