DOMAR, Y. On spectral analysis in the narrow topology. Mathematica Scandinavica, Berkeley, CA, United States, v. 4, p. 328–332, 1956. DOI: 10.7146/math.scand.a-10481. Disponível em: https://journals.msp.org/mscand/article/view/2842. Acesso em: 25 jul. 2026.