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Submitted on: 15 April 2014.
Revised on: 15 May 2014.
Accepted on: 05 June 2014.
MARKETING LETTERS---SPRINGER
Submitted on: 01 October 2009.
Revised on: 13 October 2009.
Accepted on: 18 October 2009.
MARKETING LETTERS
Submitted on: 27 March 1998.
Revised on: 10 April 1998.
Accepted on: 17 April 1998.
MARKETING LETTERS
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