%0 Journal Article %A V. M. Krasnosel'skii %T Investigation of small solutions of a certain class of nonlinear operator equations %J Doklady Akademii Nauk %D 1968 %P 22-24 %V 180 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1968_180_1_a4/ %G ru %F DAN_1968_180_1_a4