Farzad Hassanzadeh David Rappaport Approximation Algorithms for Finding a Minimum Perimeter Polygon Intersecting a Set of Line Segments. 363-374 2009 WADS http://dx.doi.org/10.1007/978-3-642-03367-4_32 conf/wads/2009 db/conf/wads/wads2009.html#HassanzadehR09