%0 Journal Article %A V. P. Motornyi %T Approximation of functions by algebraic polynomials in the $L_p$ metric %J Izvestiya. Mathematics %D 1971 %P 889-914 %V 5 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1971_5_4_a8/ %G en %F IM2_1971_5_4_a8