References
[Humphreys, 1994]
Humphreys, Paul. Patrick Suppes: scientific philosopher: philosophy of physics, theory structure, and measurement theory . Dordrecht; Boston; London: Kluwer Academic; 1994. ISBN: 0-7923-2553-2.
Cyberspace geography visualization - 15 October 1995
Luc Girardin, The Graduate Institute of International Studies