1. Ashman H, Chase G (1993) Link management within a geographic hypermedia information system. In: Proceedings of the 4th Australian Conference on Information Systems, pp 327–334
2. Boursier P, Mainguenaud M (1992) Spatial query languages: extended SQL vs. Visual languages vs. hypermaps. In: Proceedings of the 5th Int. Conference on Spatial Data Handling, Charleston, VA, USA
3. Bush V (1945) As we may think. The Atlantic Monthly, vol 176(1), pp 101–108
4. Buttenfield BP, Weber CR (1993) Visualization and hypermedia in geographical information systems. In: Medyckyj-Scott D, Hearnshaw HM (eds) Human factors in geographical information systems, Belhaven Press, pp 136–147
5. Caporal J, Viémont Y (1997) Maps as a metaphor in a geographical hypermedia system. Journal of Visual Languages and Computing, vol 8, pp 3–25