LAURSEN, Kjeld B. On Discontinuous Homomorphisms of $L^1(G)$. Mathematica Scandinavica, Berkeley, CA, United States, v. 30, p. 263–266, 1972. DOI: 10.7146/math.scand.a-11082. Disponível em: https://journals.msp.org/mscand/article/view/2242. Acesso em: 25 jul. 2026.