%0 Journal Article %A M. V. Babushkin %A V. V. Zhuk %T Growth of norms in $L_2$ of derivatives of Steklov functions and properties of functions defined by best approximations and Fourier coefficients %J Zapiski Nauchnykh Seminarov POMI %D 2016 %P 5-32 %V 445 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2016_445_a0/ %G ru %F ZNSL_2016_445_a0