KEHLET, E. T. On extensions of locally compact groups and unitary groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 45, p. 35–49, 1979. DOI: 10.7146/math.scand.a-11823. Disponível em: https://www.mscand.dk/article/view/11823. Acesso em: 5 may. 2024.