%0 Journal Article %A N. K. Rakhmetov %T On the uniqueness of a polynomial of best approximation in the classes $\varphi(L)$ %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1990 %P 83-85 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1990_4_a21/ %G ru %F VMUMM_1990_4_a21