1. A. S. Belov, in:Constructive Function Theory and Applications. Conference Abstracts [in Russian], Makhachkala (1994), pp. 17–19.
2. A. M. Odlyzko,J. London Math. Soc.,26, No. 3, 412–420 (1982).
3. M. N. Kolountzakis,Proc. Amer. Math. Soc.,120, 157–163 (1984).
4. A. S. Belov, in:International Conference “Function Spaces, Approximation Theory, and Nonlinear Analysis” dedicated to the 90th birthday of Academician S. M. Nikol'skii. Abstracts [in Russian], Moscow (1995), pp. 40–41.
5. A. S. Belov,Mat. Zametki [Math. Notes],30, No. 4, 501–515 (1981).