Submitted on: 09 November 2003.
Revised on: 24 December 2003.
Accepted on: 07 February 2004.
___________________Environment and Planning E-Nature and Space
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Submitted on: 03 June 1999.
Revised on: 17 August 1999.
Accepted on: 05 October 1999.
___________________Environment and Planning E-Nature and Space
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