Eric Sheppard Helen Couclelis Stephen Graham J. W. Harrington Harlan Onsrud Geographies of the information society. 797-823 1999 13 International Journal of Geographical Information Science 8 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=13&issue=8&spage=797 db/journals/gis/gis13.html#SheppardCGHO99