@article{DAN_1989_305_6_a12,
     author = {O. A. Alimov and M. B. Gokhberg and E. V. Liperovskaya and I. L. Gufel'd and V. A. Liperovskii and L. N. Rubtsov},
     title = {The effect of sudden decreases of ionosphere sporadic $E_s$ layer as a forerunner of earthquakes},
     journal = {Doklady Akademii Nauk},
     pages = {1335--1339},
     year = {1989},
     volume = {305},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_6_a12/}
}