@article{IM2_1999_63_6_a3,
     author = {A. Ya. Maltsev},
     title = {Conservation of {Hamiltonian} structures in {Whitham's} averaging method},
     journal = {Izvestiya. Mathematics},
     pages = {1171--1201},
     year = {1999},
     volume = {63},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1999_63_6_a3/}
}