References
[Schnyder, 1990]
Schnyder, Walter. Embedding planar graphs on the grid. Proceedings of the ACM-SIAM symposium on discrete algorithms; 1990 January 22; San Francisco. Society for Industrial and Applied Mathematics; 1990: 138-148. ISBN: 0-89871-251-3.
Cyberspace geography visualization - 15 October 1995
Luc Girardin, The Graduate Institute of International Studies