%0 Journal Article %A Yu. F. Kopnichev %T A method of determination of strong earthquake focus radiation structure according to the shape of $P$-wave envelope %J Doklady Akademii Nauk %D 1977 %P 794-797 %V 234 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1977_234_4_a16/ %G ru %F DAN_1977_234_4_a16