%0 Journal Article %A I. A. Ibragimov %A R. Z. Khas'minskii %T On some problems of nonparametric estimation of the value of a linear functional %J Doklady Akademii Nauk %D 1981 %P 781-783 %V 256 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_256_4_a1/ %G ru %F DAN_1981_256_4_a1