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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     author = {R. N. Fadeev},
     title = {Necessary and sufficient conditions of belonging to the {Besov--Potapov} classes and {Fourier} coefficients with respect to multiplicative systems},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {41--48},
     publisher = {mathdoc},
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     number = {4},
     year = {2012},
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     url = {http://geodesic.mathdoc.fr/item/ISU_2012_12_4_a7/}
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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/