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Submitted on: 05 April 2005.
Revised on: 04 May 2005.
Accepted on: 30 May 2005.
___________________Economics of Governance---SPRINGER HEIDELBERG
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Submitted on: 17 July 2012.
Revised on: 24 October 2012.
Accepted on: 22 November 2012.
___________________Economics of Governance---SPRINGER HEIDELBERG
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