%0 Journal Article %A I. V. Skrypnik %T On the application of Morse’s method to nonlinear elliptic equations %J Doklady Akademii Nauk %D 1972 %P 769-771 %V 202 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1972_202_4_a7/ %G ru %F DAN_1972_202_4_a7