Submitted on: 31 August 2003.
Revised on: 03 November 2003.
Accepted on: 01 December 2003.
___________________Cliometrica---SPRINGER HEIDELBERG
Submitted on: 15 December 2017.
Revised on: 14 April 2018.
Accepted on: 27 May 2018.
___________________Cliometrica---SPRINGER HEIDELBERG
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http://reply.papertrans.cn/1/58/5778/5778-24.png
Submitted on: 23 February 2000.
Revised on: 11 April 2000.
Accepted on: 18 May 2000.
___________________Cliometrica---SPRINGER HEIDELBERG
Submitted on: 10 September 2009.
Revised on: 12 October 2009.
Accepted on: 01 November 2009.
___________________Cliometrica---SPRINGER HEIDELBERG
Submitted on: 25 June 2017.
Revised on: 03 September 2017.
Accepted on: 09 October 2017.
___________________Cliometrica---SPRINGER HEIDELBERG
Submitted on: 03 March 2005.
Revised on: 25 March 2005.
Accepted on: 21 April 2005.
___________________Cliometrica---SPRINGER HEIDELBERG
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Submitted on: 19 September 2017.
Revised on: 17 October 2017.
Accepted on: 13 November 2017.
___________________Cliometrica---SPRINGER HEIDELBERG