%0 Journal Article %A A. I. Koshelev %T Involution transformations and the method of successive approximations for elliptic equations %J Doklady Akademii Nauk %D 1963 %P 274-276 %V 148 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a8/ %G ru %F DAN_1963_148_2_a8