%0 Journal Article %A A. Ya. Maltsev %T Conservation of Hamiltonian structures in Whitham's averaging method %J Izvestiya. Mathematics %D 1999 %P 1171-1201 %V 63 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1999_63_6_a3/ %G en %F IM2_1999_63_6_a3