%0 Journal Article
%A V. A. Sharafutdinov
%T Quasi-isotropic approximation of geometric optics, and tomography
%J Doklady Akademii Nauk
%D 1992
%P 847-850
%V 323
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_323_5_a9/
%G ru
%F DAN_1992_323_5_a9