@article {Kamiya:October 2004:0236-5294:103,
	author = "Kamiya, Yuichi",
	title = "On spectrums of certain harmonic functions attached to the Riemann zeta-function",
	journal = "Acta Mathematica Hungarica",
	volume = "105",
	year = "October 2004",
	abstract = "A. Beurling introduced harmonic functions attached to measurable functions satisfying suitable conditions and defined their spectral sets. The concept of spectral sets is closely related to approximations by trigonometric polynomials. In this paper we consider spectral sets of the harmonic functions attached to the Riemann zeta-function and its modification.",
	pages = "103-114(12)",
	url = "http://www.ingentaconnect.com/content/klu/amhu/2004/00000105/F0020001/05380326"
	doi = "doi:10.1023/B:AMHU.0000045534.41502.3e"
}