%0 Journal Article %A A. S. Makin %T The basis property of Abel-Poisson means of spectral decompositions corresponding to a strongly elliptic differential operator %J Doklady Akademii Nauk %D 1983 %P 281-284 %V 269 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1983_269_2_a4/ %G ru %F DAN_1983_269_2_a4