Submitted on: 07 April 2013.
Revised on: 27 April 2013.
Accepted on: 14 May 2013.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
Submitted on: 02 January 2013.
Revised on: 27 March 2013.
Accepted on: 24 May 2013.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
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Submitted on: 29 May 2003.
Revised on: 24 August 2003.
Accepted on: 15 October 2003.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
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Submitted on: 17 September 2003.
Revised on: 16 December 2003.
Accepted on: 31 December 2003.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
Submitted on: 22 September 2021.
Revised on: 05 January 2022.
Accepted on: 25 January 2022.
___________________ANNALS OF REGIONAL SCIENCE---SPRINGER
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