Submitted on: 28 March 2008.
Revised on: 02 May 2008.
Accepted on: 27 May 2008.
NULL
Submitted on: 13 October 2015.
Revised on: 23 October 2015.
Accepted on: 08 November 2015.
NULL
Submitted on: 20 November 2007.
Revised on: 09 December 2007.
Accepted on: 15 December 2007.
Revue de l IRES---INST RECHERCHES ECONOMIQUES & SOCIALES-IRES
Submitted on: 25 June 2008.
Revised on: 05 July 2008.
Accepted on: 11 July 2008.
NULL
Submitted on: 15 September 1999.
Revised on: 24 September 1999.
Accepted on: 16 October 1999.
Revue de l IRES---INST RECHERCHES ECONOMIQUES & SOCIALES-IRES
http://reply.papertrans.cn/3/272/27139/27139-26.png
Submitted on: 22 March 2011.
Revised on: 11 April 2011.
Accepted on: 17 April 2011.
NULL
http://reply.papertrans.cn/3/272/27139/27139-28.png
Submitted on: 08 May 2006.
Revised on: 12 June 2006.
Accepted on: 28 June 2006.
NULL
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