Michal F.Goodchild. Future direction for Geographic lnformation Science, Proceeding of Geo-Infor-matics'95 Hong Kong.1995.
[2]
National Information Infrastructure.Agenda for Action,USA.1993.9.
[3]
The National Center for Geographic Information and Analysis. Advancing Geographic Information Science. 11. 22. 1995.
[4]
University consortium for Geographic Information Science. Research priorities for Geographic Informstion Science.Cartography and Geographic Information Systems.1996,23(i ):115~127.