%0 Journal Article
%A M. A. Brutyan
%A S. V. Lyapunov
%T On the second variation of the Riabouschinsky functional
%J Doklady Akademii Nauk
%D 1981
%P 812-814
%V 258
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1981_258_4_a9/
%G ru
%F DAN_1981_258_4_a9