@article{DAN_1969_184_5_a15,
     author = {M. M. Popov},
     title = {The asymptotic behavior of certain subsequences of eigenvalues of boundary value problems for the {Helmholtz} equation in higher dimensions},
     journal = {Doklady Akademii Nauk},
     pages = {1076--1079},
     publisher = {mathdoc},
     volume = {184},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_5_a15/}
}