%0 Journal Article %A A. G. Kostyuchenko %A A. A. Shkalikov %T Summability of eigenfunction expansions of differential operators and convolution operators %J Funkcionalʹnyj analiz i ego priloženiâ %D 1978 %P 24-40 %V 12 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1978_12_4_a2/ %G ru %F FAA_1978_12_4_a2