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Submitted on: 08 May 2007.
Revised on: 19 July 2007.
Accepted on: 01 August 2007.
___________________Environment and Planning B-Urban Analytics and City Science
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Submitted on: 06 November 2013.
Revised on: 01 March 2014.
Accepted on: 01 April 2014.
___________________Environment and Planning B-Urban Analytics and City Science