%0 Journal Article
%A A. L. Bukhgeim
%A S. G. Kazantsev
%T Elliptic systems of Beltrami type and tomography problems
%J Doklady Akademii Nauk
%D 1990
%P 15-19
%V 315
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1990_315_1_a1/
%G ru
%F DAN_1990_315_1_a1