%0 Journal Article
%A A. M. Popov
%T Helmholtz potentiality conditions for systems of difference-differential equations
%J Matematičeskie zametki
%D 1998
%P 437-442
%V 64
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1998_64_3_a12/
%G ru
%F MZM_1998_64_3_a12