BISGAARD, Torben Maack. Bochner’s theorem for semigroups: A counterexample. Mathematica Scandinavica, Berkeley, CA, United States, v. 87, n. 2, p. 272–286, 2000. DOI: 10.7146/math.scand.a-14309. Disponível em: https://journals.msp.org/mscand/article/view/896. Acesso em: 24 jul. 2026.