BISGAARD, T. M. Bochner’s theorem for semigroups: A counterexample. MATHEMATICA SCANDINAVICA, [S. l.], v. 87, n. 2, p. 272–286, 2000. DOI: 10.7146/math.scand.a-14309. Disponível em: https://www.mscand.dk/article/view/14309. Acesso em: 2 may. 2024.