References
[Kruskal and Wish, 1981]
Kruskal, Joseph B. and Wish, Myron. Multidimensional scaling. Beverly Hills; London: Sage Publications; 1981. (Quantitative applications in the social sciences; 07-011). ISBN: 0-8039-0940-3.
Cyberspace geography visualization - 15 October 1995
Luc Girardin, The Graduate Institute of International Studies