Submitted on: 17 November 2006.
Revised on: 19 January 2007.
Accepted on: 27 February 2007.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
Submitted on: 17 July 2007.
Revised on: 22 September 2007.
Accepted on: 20 October 2007.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
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Submitted on: 13 October 2012.
Revised on: 30 November 2012.
Accepted on: 29 January 2013.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
Submitted on: 08 October 2018.
Revised on: 04 November 2018.
Accepted on: 09 December 2018.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
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Submitted on: 22 November 2006.
Revised on: 16 January 2007.
Accepted on: 20 February 2007.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
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