%0 Journal Article
%A I. L. Sofronov
%T Conditions for complete transparency on a sphere for a
%J Doklady Akademii Nauk
%D 1992
%P 953-957
%V 326
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_326_6_a4/
%G ru
%F DAN_1992_326_6_a4