@article{CMFD_2018_64_3_a4,
     author = {N. D. Kopachevsky and D. O. Tsvetkov},
     title = {Small motions of an ideal stratified fluid in a~basin covered with ice},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {573--590},
     publisher = {mathdoc},
     volume = {64},
     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2018_64_3_a4/}
}