%0 Journal Article
%A G. S. Ivanov-Kholodnyi
%T Estimate of the negative ion concentration in the $D$~region of the ionosphere
%J Doklady Akademii Nauk
%D 1967
%P 1328-1329
%V 177
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_177_6_a20/
%G ru
%F DAN_1967_177_6_a20