DAELE, A. V. On the spectrum of the analytic generator. MATHEMATICA SCANDINAVICA, [S. l.], v. 37, p. 307–318, 1975. DOI: 10.7146/math.scand.a-11609. Disponível em: https://www.mscand.dk/article/view/11609. Acesso em: 28 apr. 2024.