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http://reply.papertrans.cn/3/283/28230/28230-12.png
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Submitted on: 22 July 1999.
Revised on: 07 August 1999.
Accepted on: 14 August 1999.
Socio-Economic Review
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Submitted on: 06 July 2018.
Revised on: 18 August 2018.
Accepted on: 11 September 2018.
Socio-Economic Review---OXFORD UNIV PRESS
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Submitted on: 06 June 2008.
Revised on: 16 July 2008.
Accepted on: 08 August 2008.
Socio-Economic Review---OXFORD UNIV PRESS