@article{CMFD_2008_29_a6,
     author = {N. D. Kopachevskii and D. O. Tsvetkov},
     title = {Oscillations of stratified fluids},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {103--130},
     year = {2008},
     volume = {29},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2008_29_a6/}
}