GRANIRER, E. Extremely Amenable Semigroups II. MATHEMATICA SCANDINAVICA, [S. l.], v. 20, p. 93–113, 1967. DOI: 10.7146/math.scand.a-10825. Disponível em: https://tidsskrift.dk/math/article/view/10825. Acesso em: 14 aug. 2026.