%0 Journal Article
%A R. Martinez Brunet
%A A. V. Popov
%T Focal spot structure on an inhomogeneous sphere
%J Doklady Akademii Nauk
%D 1986
%P 1079-1083
%V 289
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1986_289_5_a12/
%G ru
%F DAN_1986_289_5_a12