%0 Journal Article
%A G. A. Sobolev
%A L. B. Slavina
%T Change in the $v_p/v_s$ field before the strong earthquakes of Kamchatka
%J Doklady Akademii Nauk
%D 1977
%P 81-84
%V 233
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_233_1_a20/
%G ru
%F DAN_1977_233_1_a20