@article{ZVMMF_1992_32_2_a11,
     author = {A. S. Bratus' and A. D. Myshkis},
     title = {The relation between the first and second natural frequencies of vibrations of a membrane},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {320--325},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1992_32_2_a11/}
}