Submitted on: 01 January 2003.
Revised on: 27 January 2003.
Accepted on: 15 February 2003.
QME-Quantitative Marketing and Economics
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Submitted on: 01 September 2016.
Revised on: 13 October 2016.
Accepted on: 19 October 2016.
QME-Quantitative Marketing and Economics
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Submitted on: 18 March 2018.
Revised on: 09 April 2018.
Accepted on: 30 April 2018.
QME-Quantitative Marketing and Economics