@article{DAN_1994_335_4_a1,
     author = {A. V. Borovskikh and K. P. Lazarev and Yu. V. Pokorny},
     title = {Oscillatory spectral properties of discontinuous boundary value},
     journal = {Doklady Akademii Nauk},
     pages = {409--412},
     publisher = {mathdoc},
     volume = {335},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_335_4_a1/}
}