GRANIRER, E. Extremely Amenable Semigroups. MATHEMATICA SCANDINAVICA, [S. l.], v. 17, p. 177–197, 1965. DOI: 10.7146/math.scand.a-10772. Disponível em: https://www.mscand.dk/article/view/10772. Acesso em: 3 may. 2024.