%0 Journal Article %A A. S. Fokht %T Bounds for the derivatives of ultraspherical polynomials in the $L_p$, $1 %J Differencialʹnye uravneniâ %D 1979 %P 717-724 %V 15 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1979_15_4_a15/ %G ru %F DE_1979_15_4_a15