Submitted on: 01 May 2012.
Revised on: 24 August 2012.
Accepted on: 20 October 2012.
___________________Electronic Commerce Research---SPRINGER
Submitted on: 20 February 2010.
Revised on: 01 April 2010.
Accepted on: 19 April 2010.
___________________Electronic Commerce Research---SPRINGER
Submitted on: 18 February 2000.
Revised on: 15 May 2000.
Accepted on: 26 May 2000.
___________________Electronic Commerce Research---SPRINGER
Submitted on: 30 April 2007.
Revised on: 14 August 2007.
Accepted on: 24 September 2007.
___________________Electronic Commerce Research---SPRINGER
Submitted on: 22 January 2017.
Revised on: 15 February 2017.
Accepted on: 14 April 2017.
___________________Electronic Commerce Research---SPRINGER
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