%0 Journal Article
%A V. I. Alfyorov
%A A. S. Biriukov
%A L. M. Dmitriev
%A Yu. E. Markachev
%A V. M. Marchenko
%A A. M. Prokhorov
%T On the possibility of obtaining the inversion of energy level populations in the heterogeneous

%J Doklady Akademii Nauk
%D 1979
%P 1093-1096
%V 248
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a16/
%G ru
%F DAN_1979_248_5_a16