Submitted on: 16 December 2004.
Revised on: 12 March 2005.
Accepted on: 03 April 2005.
___________________Cliometrica---SPRINGER HEIDELBERG
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Submitted on: 06 October 2006.
Revised on: 15 November 2006.
Accepted on: 06 January 2007.
___________________Cliometrica---SPRINGER HEIDELBERG
Submitted on: 22 January 2019.
Revised on: 08 March 2019.
Accepted on: 21 April 2019.
___________________Cliometrica---SPRINGER HEIDELBERG
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