%0 Journal Article %A N. A. Il'yasov %T On the Direct Theorem of Approximation Theory of Periodic Functions in Different Metrics %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1997 %P 220-234 %V 219 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1997_219_a14/ %G ru %F TM_1997_219_a14