Geodesic
On two theorems of Lorentz
Izvestiya. Mathematics , Tome 69 (2005) no. 1, pp. 163-175.

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We find necessary and sufficient conditions for a function to belong to the Weyl–Nikolskii class. 
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S. Yu. Tikhonov. On two theorems of Lorentz. Izvestiya. Mathematics , Tome 69 (2005) no. 1, pp. 163-175. http://geodesic.mathdoc.fr/item/IM2_2005_69_1_a7/

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