of a point set 
with respect to a pointed planar straight
line graph 
. For the case that 
forms a simple polygon 
with vertex set we give tight bounds on the vertex degree of
.
of a point set with respect to a pointed planar straight
line graph . For the case that forms a simple polygon
with vertex set we give tight bounds on the vertex degree of
.
Annual Canadian Conference on Computational Geometry CCCG
2003, pages 155-158, Halifax, Nova Scotia, Canada, 2003.