%0 Journal Article %A V. È. Katsnelson %T Conditions under which systems of eigenvectors of some classes of operators form a basis %J Funkcionalʹnyj analiz i ego priloženiâ %D 1967 %P 39-51 %V 1 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1967_1_2_a2/ %G ru %F FAA_1967_1_2_a2