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Submitted on: 03 October 1999.
Revised on: 12 December 1999.
Accepted on: 09 February 2000.
___________________European Management Journal---ELSEVIER SCI LTD
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Submitted on: 24 April 2011.
Revised on: 14 August 2011.
Accepted on: 05 October 2011.
___________________European Management Journal---ELSEVIER SCI LTD
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