%------------------------
% Visibility complex
%------------------------
@inproceedings
 {poc90,
  author="M. Pocchiola",
  title="Graphics in flatland revisited",
  booktitle="SWAT - LNCS 447",
  year="1990",
  address="",
 }

@inproceedings
 {veg,
  author="G. Vegter",
  title="The visibility diagram : a structure for visibility problems and
         motion planning",
  booktitle="SWAT - LNCS 447",
  year="1990",
 }

@inproceedings
 {gho,
  author="S. Ghosh and D. Mount",
  title="An output sensitive algorithm for computing visibility graphs",
  booktitle="IEEE FOCS",
  year="1987"
 }


@article
 {wel,
  author="E. Welzl",
  title="Constructing the visibility graph for n-line segments in $0(n^{2})$
         time",
  journal="Information Processing Letters",
  year="1985",
  volume="20",
  number="",  
  pages="167-171"
 }


@article
 {wove,
  author="M. Overmars and E. Welzl",
  title="New methods for computing visibility graphs",
  journal="?",
  year="1988",
  volume="",
  number="",  
  pages="164-171",
 }