%0 Journal Article
%A N. G. Sorokina
%T Energy relations for multidimensional equations of mixed type
%J Differencialʹnye uravneniâ
%D 1973
%P 158-161
%V 9
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_1_a17/
%G ru
%F DE_1973_9_1_a17