%0 Journal Article %A Ya. I. Al'ber %T Solution of nonlinear operator equations by steepest descent type methods %J Doklady Akademii Nauk %D 1970 %P 255-258 %V 193 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1970_193_2_a0/ %G ru %F DAN_1970_193_2_a0