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Submitted on: 15 September 2019.
Revised on: 27 October 2019.
Accepted on: 24 November 2019.
___________________European Research on Management and Business Economics
Submitted on: 07 August 2020.
Revised on: 21 September 2020.
Accepted on: 08 November 2020.
___________________European Research on Management and Business Economics
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Submitted on: 22 June 2014.
Revised on: 20 September 2014.
Accepted on: 16 November 2014.
___________________European Research on Management and Business Economics
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Submitted on: 23 January 2006.
Revised on: 25 April 2006.
Accepted on: 17 May 2006.
___________________European Research on Management and Business Economics
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Submitted on: 16 October 2015.
Revised on: 09 December 2015.
Accepted on: 26 January 2016.
___________________European Research on Management and Business Economics