FOLNER, Erling. Generalization of a theorem of Bogolioùboff to topological groups. With an appendix on Banach mean values in nonabelian groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 2, p. 5–18, 1954. DOI: 10.7146/math.scand.a-10389. Disponível em: https://tidsskrift.dk/math/article/view/10389. Acesso em: 14 aug. 2026.