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Submitted on: 30 November 2010.
Revised on: 15 January 2011.
Accepted on: 01 February 2011.
___________________INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS
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Submitted on: 23 September 2003.
Revised on: 30 December 2003.
Accepted on: 23 February 2004.
___________________INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS