%0 Journal Article %A V. F. Veselov %T Bases from eigensubspaces of a nondissipative operator and the characteristic function %J Funkcionalʹnyj analiz i ego priloženiâ %D 1988 %P 76-77 %V 22 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1988_22_4_a9/ %G ru %F FAA_1988_22_4_a9