%0 Journal Article %A K. K. Golovkin %T Uniform equivalence of parametric norms in ergodic and approximation theories %J Izvestiya. Mathematics %D 1971 %P 915-934 %V 5 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1971_5_4_a9/ %G en %F IM2_1971_5_4_a9