WONG, J. C. S. Characterisations of extremly amenable semigroups. MATHEMATICA SCANDINAVICA, [S. l.], v. 48, p. 101–108, 1981. DOI: 10.7146/math.scand.a-11903. Disponível em: https://www.mscand.dk/article/view/11903. Acesso em: 1 may. 2024.