PATERSON, Alan L. T. Amenability and locally compact semigroups. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 271–288, 1978. DOI: 10.7146/math.scand.a-11753. Disponível em: https://journals.msp.org/mscand/article/view/1890. Acesso em: 25 jul. 2026.