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Submitted on: 22 October 1998.
Revised on: 11 November 1998.
Accepted on: 15 December 1998.
___________________European Research on Management and Business Economics
Submitted on: 26 August 2006.
Revised on: 23 November 2006.
Accepted on: 05 December 2006.
___________________European Research on Management and Business Economics
Submitted on: 17 November 2005.
Revised on: 01 January 2006.
Accepted on: 09 February 2006.
___________________European Research on Management and Business Economics
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Submitted on: 16 November 2014.
Revised on: 20 February 2015.
Accepted on: 31 March 2015.
___________________European Research on Management and Business Economics
Submitted on: 02 January 2018.
Revised on: 04 March 2018.
Accepted on: 01 April 2018.
___________________European Research on Management and Business Economics
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Submitted on: 08 May 2021.
Revised on: 23 June 2021.
Accepted on: 16 July 2021.
___________________European Research on Management and Business Economics
Submitted on: 14 April 2003.
Revised on: 28 May 2003.
Accepted on: 02 July 2003.
___________________European Research on Management and Business Economics