On Regular Vertices of the Union of Planar Convex Objects.

Esther Ezra János Pach Micha Sharir On Regular Vertices of the Union of Planar Convex Objects. 216-231 2009 41 Discrete & Computational Geometry 2 http://dx.doi.org/10.1007/s00454-008-9118-2 db/journals/dcg/dcg41.html#EzraPS09