References
[Moré and Wright, 1993]
Moré, Jorge J. and Wright, Stephen J. Optimization software guide. Philadelphia: Society for Industrial and Applied Mathematics; 1993. (Conghran, W. M. and Grosse, Eric. Frontiers in applied mathematics; 14). ISBN: 0-89871-322-6.
Cyberspace geography visualization - 15 October 1995
Luc Girardin, The Graduate Institute of International Studies