Jérôme Hulin Edouard Thiel Appearance Radii in Medial Axis Test Mask for Small Planar Chamfer Norms. 434-445 2009 DGCI http://dx.doi.org/10.1007/978-3-642-04397-0_37 conf/dgci/2009 db/conf/dgci/dgci2009.html#HulinT09