@article{DAN_1973_212_6_a12,
     author = {M. D. Dolberg and N. N. Yasnitskaya},
     title = {Lower bounds for the oscillation frequencies of an elastic system. {Generalized} {Dunkerly--Papkovich} estimates},
     journal = {Doklady Akademii Nauk},
     pages = {1317--1319},
     publisher = {mathdoc},
     volume = {212},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_6_a12/}
}