@article {MR2040158,
	title = {The structure of the spectra of Pisot numbers},
	journal = {J. Number Theory},
	volume = {105},
	year = {2004},
	pages = {262{\textendash}274},
	issn = {0022-314X},
	doi = {10.1016/j.jnt.2003.10.001},
	url = {http://dx.doi.org/10.1016/j.jnt.2003.10.001},
	author = {Hare, Kevin G.}
}
