%0 Journal Article %A L. P. Lebedev %T Effective construction of methods of best approximation %J Doklady Akademii Nauk %D 1962 %P 530-533 %V 142 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1962_142_3_a7/ %G ru %F DAN_1962_142_3_a7