Submitted on: 13 April 2015.
Revised on: 27 April 2015.
Accepted on: 04 May 2015.
OPEN ECONOMIES REVIEW
Submitted on: 22 July 1999.
Revised on: 16 August 1999.
Accepted on: 10 September 1999.
OPEN ECONOMIES REVIEW---SPRINGER
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Submitted on: 23 January 2002.
Revised on: 05 March 2002.
Accepted on: 02 April 2002.
OPEN ECONOMIES REVIEW
Submitted on: 30 October 2011.
Revised on: 17 November 2011.
Accepted on: 06 December 2011.
OPEN ECONOMIES REVIEW---SPRINGER
http://reply.papertrans.cn/3/237/23639/23639-36.png