@article{DAN_1977_234_4_a16,
     author = {Yu. F. Kopnichev},
     title = {A method of determination of strong earthquake focus radiation structure according to the shape of $P$-wave envelope},
     journal = {Doklady Akademii Nauk},
     pages = {794--797},
     year = {1977},
     volume = {234},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_4_a16/}
}