@article{DAN_1976_230_6_a16,
     author = {A. V. Popov},
     title = {Short-wave asymptotics of normal modes in a locally stratified medium},
     journal = {Doklady Akademii Nauk},
     pages = {1322--1325},
     year = {1976},
     volume = {230},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_6_a16/}
}