%0 Journal Article %A N. N. Pavlov. V. V. Vershinin %T On the Stable Approximation of Derivatives by Splines in the Convex Set %J Mathematica balkanica %D 1988 %P 222 %V 2 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MABA_1988_2_2_a13/ %F MABA_1988_2_2_a13