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Submitted on: 23 November 2012.
Revised on: 01 January 2013.
Accepted on: 15 January 2013.
___________________Eurasian Business Review---SPRINGER HEIDELBERG
Submitted on: 11 May 2016.
Revised on: 03 August 2016.
Accepted on: 14 September 2016.
___________________Eurasian Business Review---SPRINGER HEIDELBERG
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Submitted on: 10 October 2006.
Revised on: 19 December 2006.
Accepted on: 12 January 2007.
___________________Eurasian Business Review---SPRINGER HEIDELBERG
Submitted on: 22 February 1998.
Revised on: 20 June 1998.
Accepted on: 19 July 1998.
___________________Eurasian Business Review---SPRINGER HEIDELBERG
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Submitted on: 26 October 2017.
Revised on: 01 January 2018.
Accepted on: 16 February 2018.
___________________Eurasian Business Review---SPRINGER HEIDELBERG