DUNCAN, J.; PATERSON, A. L. T. Amenability for discrete convolution semigroup algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 66, p. 141–146, 1990. DOI: 10.7146/math.scand.a-12298. Disponível em: https://www.mscand.dk/article/view/12298. Acesso em: 23 nov. 2024.