CHRISTENSEN, J. P. R. On Some Measures Analogous to Haar Measure. MATHEMATICA SCANDINAVICA, [S. l.], v. 26, p. 103–106, 1970. DOI: 10.7146/math.scand.a-10969. Disponível em: https://www.mscand.dk/article/view/10969. Acesso em: 3 may. 2024.