%0 Journal Article %A V. N. Kessenikh %T On possible methods of measuring the concentration of slow neutrons in the $F_2$ layer of the ionosphere %J Doklady Akademii Nauk %D 1958 %P 57-59 %V 123 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1958_123_1_a13/ %G ru %F DAN_1958_123_1_a13