SEDIG, Ismo. Some results in spectral analysis and synthesis at infinity. Mathematica Scandinavica, Berkeley, CA, United States, v. 65, p. 259–277, 1989. DOI: 10.7146/math.scand.a-12282. Disponível em: https://journals.msp.org/mscand/article/view/1368. Acesso em: 25 jul. 2026.