%0 Journal Article %A E. I. Shulman %T Additional integrals of the motion of classical Hamiltonian wave systems %J Teoretičeskaâ i matematičeskaâ fizika %D 1988 %P 88-99 %V 76 %N 1 %U http://geodesic.mathdoc.fr/item/TMF_1988_76_1_a7/ %G ru %F TMF_1988_76_1_a7