Submitted on: 22 December 2001.
Revised on: 04 January 2002.
Accepted on: 12 January 2002.
QME-Quantitative Marketing and Economics
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Submitted on: 08 April 2003.
Revised on: 22 April 2003.
Accepted on: 07 May 2003.
QME-Quantitative Marketing and Economics
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Submitted on: 18 February 2000.
Revised on: 08 March 2000.
Accepted on: 28 March 2000.
QME-Quantitative Marketing and Economics
Submitted on: 02 March 2007.
Revised on: 18 March 2007.
Accepted on: 28 March 2007.
QME-Quantitative Marketing and Economics