%0 Journal Article %A L. N. Baranskii %A L. A. Geller %A B. N. Kazak %T Propagation speed of short-period earth's electromagnetic field oscillations of the type \textit{Pc}-1 (``pearls'') %J Doklady Akademii Nauk %D 1967 %P 85-87 %V 177 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1967_177_1_a21/ %G ru %F DAN_1967_177_1_a21