%0 Journal Article
%A A. Dvoretsky 
%T Reflected Surfaces and Their Directing Cones
%J Journal for geometry and graphics
%D 2010
%P 69-8
%V 14
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2010_14_1_JGG_2010_14_1_a5/
%F JGG_2010_14_1_JGG_2010_14_1_a5