Submitted on: 29 March 2011.
Revised on: 23 April 2011.
Accepted on: 16 May 2011.
NETWORKS & SPATIAL ECONOMICS
Submitted on: 21 August 2006.
Revised on: 07 September 2006.
Accepted on: 03 October 2006.
NETWORKS & SPATIAL ECONOMICS---SPRINGER
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Submitted on: 29 January 2006.
Revised on: 24 February 2006.
Accepted on: 06 March 2006.
NETWORKS & SPATIAL ECONOMICS
Submitted on: 26 July 2016.
Revised on: 02 September 2016.
Accepted on: 14 September 2016.
NETWORKS & SPATIAL ECONOMICS---SPRINGER
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