FØLNER, Erling. On groups with full Banach mean value. MATHEMATICA SCANDINAVICA, [S. l.], v. 3, p. 243–254, 1955. DOI: 10.7146/math.scand.a-10442. Disponível em: https://tidsskrift.dk/math/article/view/10442. Acesso em: 13 aug. 2026.