%0 Journal Article %A V. S. Ryaben'kii %T The kernels of the spectra of families of operators %J Doklady Akademii Nauk %D 1969 %P 275-277 %V 185 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1969_185_2_a8/ %G ru %F DAN_1969_185_2_a8