MathSciNet bibliographic data MR1268845 04A15 (26A21 43A46) Linton, Tom The $H$$H$-sets in the unit circle are properly $G_{\delta\sigma}$$G_{\delta\sigma}$. Real Anal. Exchange 19 (1993/94), no. 1, 203–211. Links to the journal or article are not yet available

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