%0 Journal Article %A N. P. Khoroshko %T On the best approximation in the metric of $L$ to certain classes of functions by Haar-system polynomials %J Matematičeskie zametki %D 1969 %P 47-54 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1969_6_1_a5/ %G ru %F MZM_1969_6_1_a5