%0 Journal Article
%A S. A. Vavilov
%T Geometric methods for investigating the solvability of a class of
%J Doklady Akademii Nauk
%D 1992
%P 206-210
%V 323
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a2/
%G ru
%F DAN_1992_323_2_a2