@article{DAN_1976_230_3_a0,
     author = {A. B. Alekseev and M. Sh. Birman},
     title = {Asymptotic behavior of the spectrum of elliptic boundary value problems with resolvable couplings},
     journal = {Doklady Akademii Nauk},
     pages = {505--507},
     publisher = {mathdoc},
     volume = {230},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_3_a0/}
}