TOMTER, Per. A New Proof for Folner’s Condition for Maximally Almost Periodic Groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 18, p. 25–34, 1966. DOI: 10.7146/math.scand.a-10777. Disponível em: https://journals.msp.org/mscand/article/view/2525. Acesso em: 25 jul. 2026.