@article{TMF_1991_87_1_a3,
     author = {V. R. Kudashev and S. E. Sharapov},
     title = {Inheritance {of~KdV} symmetries under {Whitham} averaging and hydrodynamic symmetries of the {Witham} equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {40--47},
     year = {1991},
     volume = {87},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_87_1_a3/}
}