%0 Journal Article
%A A. P. Kiselev
%T Focusing of the WKB-solutions of the equation $[\Delta+k^2n^2(x)]u=0$, $k\to\infty$
%J Zapiski Nauchnykh Seminarov POMI
%D 1975
%P 123-128
%V 51
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1975_51_a6/
%G ru
%F ZNSL_1975_51_a6