%0 Journal Article %A V. N. Poroshenko %T Uniqueness of an algebraic polynomial of best approximation in the~$L_1$ metric %J Matematičeskie zametki %D 1981 %P 817-828 %V 29 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1981_29_6_a2/ %G ru %F MZM_1981_29_6_a2