%0 Journal Article %A Yu. Sh. Abramov %T On the theory of nonlinear eigenvalue problems %J Doklady Akademii Nauk %D 1973 %P 11-14 %V 212 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1973_212_1_a0/ %G ru %F DAN_1973_212_1_a0