References
[Press et al., 1994]
Press, William H.; Teukolsky, Saul A.; Flannery, Brian P.; Vetterling. Numerical recipes: the art of scientific computing. Cambridge: Cambridge University Press; 1988. ISBN: 0-521-30811-9.
Cyberspace geography visualization - 15 October 1995
Luc Girardin, The Graduate Institute of International Studies