%0 Journal Article %A S. B. Stechkin %A S. A. Telyakovskii %T The approximation of differentiable functions by trigonometric polynomials in the $L$~metric %J Informatics and Automation %D 1967 %P 20-29 %V 88 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1967_88_a2/ %G ru %F TRSPY_1967_88_a2