%0 Journal Article %A Ya. Sh. Salimov %T Estimation of the spectral function corresponding to an expansion %J Doklady Akademii Nauk %D 1985 %P 53-56 %V 284 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1985_284_1_a11/ %G ru %F DAN_1985_284_1_a11