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Submitted on: 21 October 2003.
Revised on: 27 December 2003.
Accepted on: 10 February 2004.
___________________Journal of Revenue and Pricing Management
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Submitted on: 14 July 2001.
Revised on: 07 October 2001.
Accepted on: 03 November 2001.
___________________Journal of Revenue and Pricing Management
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Submitted on: 05 May 2000.
Revised on: 10 June 2000.
Accepted on: 02 August 2000.
___________________Journal of Revenue and Pricing Management
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Submitted on: 01 October 2005.
Revised on: 27 October 2005.
Accepted on: 14 November 2005.
___________________Journal of Revenue and Pricing Management