LINDAHL, Lars-ake. On Narrow Spectral Analysis. MATHEMATICA SCANDINAVICA, [S. l.], v. 26, p. 149–164, 1970. DOI: 10.7146/math.scand.a-10974. Disponível em: https://tidsskrift.dk/math/article/view/10974. Acesso em: 14 aug. 2026.