%0 Journal Article %A M. G. Gasymov %T On the sum of the differences of the eigenvalues of two self-adjoint operators %J Doklady Akademii Nauk %D 1963 %P 1202-1205 %V 150 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_150_6_a3/ %G ru %F DAN_1963_150_6_a3