%0 Journal Article
%A N. V. Zepelev
%T The shadow zone on the weak boundary of inhomogeneous mediums
%J Zapiski Nauchnykh Seminarov POMI
%D 1969
%P 187-201
%V 15
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1969_15_a12/
%G ru
%F ZNSL_1969_15_a12