%0 Journal Article
%A P. E. Krasnushkin
%T The propagation of long and ultra-long radio waves about the earth in the lower ($C$, $D$, and $E$) layers 

%J Doklady Akademii Nauk
%D 1961
%P 67-70
%V 139
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a17/
%G ru
%F DAN_1961_139_1_a17