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Submitted on: 07 February 2013.
Revised on: 08 May 2013.
Accepted on: 02 July 2013.
___________________APPLIED ERGONOMICS---ELSEVIER SCI LTD
Submitted on: 07 May 2003.
Revised on: 01 September 2003.
Accepted on: 25 October 2003.
___________________APPLIED ERGONOMICS---ELSEVIER SCI LTD
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