%0 Journal Article
%A M. B. Sheftel
%T Higher integrals and symmetries of semi-Hamiltonian systems
%J Differencialʹnye uravneniâ
%D 1993
%P 1782-1795
%V 29
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1993_29_10_a13/
%G ru
%F DE_1993_29_10_a13