%0 Journal Article
%A I. M. Lavrent'ev
%T On the variational theory of nonlinear equations
%J Doklady Akademii Nauk
%D 1966
%P 284-286
%V 166
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_166_2_a6/
%G ru
%F DAN_1966_166_2_a6