@article{JMAG_2002_9_3_a9,
     author = {D. A. Zakora and N. D. Kopachevsky},
     title = {On small motions and normal oscillations of a hydrosystem {\textquotedblleft}a~viscous fluid + a system of ideal fluids{\textquotedblright}},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {420--426},
     year = {2002},
     volume = {9},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2002_9_3_a9/}
}