@article{DAN_1989_307_4_a12,
     author = {L. A. Nazarov},
     title = {Wave propagation in media with thin layers},
     journal = {Doklady Akademii Nauk},
     pages = {824--828},
     year = {1989},
     volume = {307},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_4_a12/}
}