TY  - JOUR
AU  - A. Dvoretsky 
TI  - Reflected Surfaces and Their Directing Cones
JO  - Journal for geometry and graphics
PY  - 2010
SP  - 69
EP  - 8
VL  - 14
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2010_14_1_JGG_2010_14_1_a5/
ID  - JGG_2010_14_1_JGG_2010_14_1_a5
ER  -