@article{DAN_1988_302_3_a16,
     author = {B. A. Trubnikov and P. P. Firstov},
     title = {On the frequency spectrum of inhomogeneous volcano cone oscillations},
     journal = {Doklady Akademii Nauk},
     pages = {587--590},
     publisher = {mathdoc},
     volume = {302},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_302_3_a16/}
}