Geodesic
Necessary and sufficient conditions of belonging to the Besov--Potapov classes and Fourier coefficients with respect to multiplicative systems
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 4, pp. 41-48.

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In this paper we obtain necessary and sufficient conditions for a function to belong to the Besov–Potapov classes. Using functions with Fourier coefficients with respect to multiplicative systems from the class GM, we show the sharpness of some these results. 
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R. N. Fadeev. Necessary and sufficient conditions of belonging to the Besov--Potapov classes and Fourier coefficients with respect to multiplicative systems. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 4, pp. 41-48. http://geodesic.mathdoc.fr/item/ISU_2012_12_4_a7/

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