@article{UZERU_1997_2_a3,
     author = {V. R. Barseghyan and V. V. Hayrapetian},
     title = {On the observation problem of controlled vibrations of membrane},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {21--26},
     publisher = {mathdoc},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_1997_2_a3/}
}