%0 Journal Article %A I. M. Vilensky %T On a non-linear effect in radio-wave propagation in the ionosphere %J Doklady Akademii Nauk %D 1970 %P 1041-1043 %V 191 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1970_191_5_a19/ %G ru %F DAN_1970_191_5_a19