%0 Journal Article %A K. Kh. Boimatov %A A. G. Kostyuchenko %T The asymptotic behavior of Riesz means of the spectral function of an elliptic operator %J Doklady Akademii Nauk %D 1978 %P 517-520 %V 241 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_241_3_a3/ %G ru %F DAN_1978_241_3_a3