[Kraaijveld et al., 1993]

Kraaijveld, Martin A.; Mao, Jiangchang, and Jain, Anil K. A non-linear projection method based on Kohonen's topology preserving maps. IEEE Computer Society, editor. Proceedings of the 11th IAPR International Conference on Pattern Recognition; 1993 August 3; The Hague. Washington; Brussels; Tokyo: IEEE; 1992 ISBN: 0-8186-2915-0.

Cyberspace geography visualization - 15 October 1995

Luc Girardin, The Graduate Institute of International Studies