%0 Journal Article
%A S. E. Zhelezovsky
%T A dual variational principle for the wave equation
%J Differencialʹnye uravneniâ
%D 1992
%P 1033-1039
%V 28
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1992_28_6_a13/
%G ru
%F DE_1992_28_6_a13