FOLNER, E. Note on groups with and without full Banach mean value. MATHEMATICA SCANDINAVICA, [S. l.], v. 5, p. 5–11, 1957. DOI: 10.7146/math.scand.a-10482. Disponível em: https://www.mscand.dk/article/view/10482. Acesso em: 2 may. 2024.