HELSON, Henry; BEURLING, Arne. Fourier-Stieltjes transforms with bounded powers. Mathematica Scandinavica, Berkeley, CA, United States, v. 1, p. 120–126, 1953. DOI: 10.7146/math.scand.a-10371. Disponível em: https://journals.msp.org/mscand/article/view/2952. Acesso em: 25 aug. 2026.