[1] London Sch Econ, Dept Sociol, Houghton St, London WC2A 2AE, England
[2] Univ York, Dept Sociol, York YO10 5DD, N Yorkshire, England
[3] Univ Durham, Dept Geog, South Rd, Durham DH1 3LE, England
[4] Univ Bergen, Dept Sociol, Postboks 7800, NO-5020 Bergen, Norway