%0 Journal Article %A È. S. Belinskii %T Approximation by a ``floating'' system of exponentials on classes of smooth periodic functions %J Sbornik. Mathematics %D 1988 %P 19-27 %V 60 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1988_60_1_a1/ %G en %F SM_1988_60_1_a1