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Submitted on: 12 November 2011.
Revised on: 28 January 2012.
Accepted on: 03 March 2012.
___________________Environment and Planning A-Economy and Space
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Submitted on: 29 July 2011.
Revised on: 15 October 2011.
Accepted on: 05 November 2011.
___________________Environment and Planning A-Economy and Space
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