Marta Fort Joan Antoni Sellarès Generalized Higher-Order Voronoi Diagrams on Polyhedral Surfaces. 74-83 2007 conf/isvd/2007 ISVD http://doi.ieeecomputersociety.org/10.1109/ISVD.2007.24 db/conf/isvd/isvd2007.html#FortS07