ENFLO, Per. Topological Groups in Which Multiplication on One Side is Differentiable or Linear. Mathematica Scandinavica, Berkeley, CA, United States, v. 24, p. 195–207, 1969. DOI: 10.7146/math.scand.a-10930. Disponível em: https://journals.msp.org/mscand/article/view/2374. Acesso em: 25 jul. 2026.