%0 Journal Article %A O. A. Alimov %A M. B. Gokhberg %A E. V. Liperovskaya %A I. L. Gufel'd %A V. A. Liperovskii %A L. N. Rubtsov %T The effect of sudden decreases of ionosphere sporadic $E_s$ layer as a forerunner of earthquakes %J Doklady Akademii Nauk %D 1989 %P 1335-1339 %V 305 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1989_305_6_a12/ %G ru %F DAN_1989_305_6_a12