References
[Eades, 1984]
Eades, Peter. A heuristic for graph drawing Stanton. Ralph G., editor. Congressus numerantium. Winnipeg: Utilitas Mathematica; 1984 May: 149-160. ISBN: 0-919628-42-7.
Cyberspace geography visualization - 15 October 1995
Luc Girardin, The Graduate Institute of International Studies