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Submitted on: 15 March 2002.
Revised on: 18 April 2002.
Accepted on: 08 May 2002.
___________________JOURNAL OF ECONOMIC GEOGRAPHY---OXFORD UNIV PRESS
Submitted on: 07 September 2004.
Revised on: 22 December 2004.
Accepted on: 06 January 2005.
___________________JOURNAL OF ECONOMIC GEOGRAPHY---OXFORD UNIV PRESS
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Submitted on: 02 December 2003.
Revised on: 01 March 2004.
Accepted on: 12 March 2004.
___________________JOURNAL OF ECONOMIC GEOGRAPHY---OXFORD UNIV PRESS