KEPERT, Andrew. Amenability in Group Algebras and Banach Algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 74, p. 275–292, 1994. DOI: 10.7146/math.scand.a-12497. Disponível em: https://journals.msp.org/mscand/article/view/1129. Acesso em: 25 jul. 2026.