LAURSEN, Kjeld B. On Discontinuous Homomorphisms of $L^1(G)$. MATHEMATICA SCANDINAVICA, [S. l.], v. 30, p. 263–266, 1972. DOI: 10.7146/math.scand.a-11082. Disponível em: https://tidsskrift.dk/math/article/view/11082. Acesso em: 14 aug. 2026.