@inproceedings{pin-rez-00-cccc,
  author = {G. Pinto and P. de Rezende},
  title = {Additively Weighted {Voronoi} Diagram in the Oriented Projective Plane},
  booktitle = {Proc. 12th Canadian Conference on Computational Geometry},
  year = 2000,
  url = {http://www.cs.unb.ca/conf/cccg/eProceedings/18.ps.gz},
  comment = {Uses oriented projective geometry.}
}