1. Dept of Geography, University of California, Los Angeles, CA 90095-1524, USA
2. Department of Geography, University of Hull, Hull, HU6 7RX, England
3. Institute of Geography, University of Paris IV, 75230 Paris Cedex 05, France
4. Dept of Geography, University of Manchester, Manchester M13 9PL, England
5. Dept of Sociology, Catholic University of the Sacred Heart, Largo A. Gemelli 1, 20123 Milan, Italy
6. Dept of Urban and Regional Planning, University of California, Los Angeles, CA 90095-1524, USA