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Submitted on: 15 January 2005.
Revised on: 28 April 2005.
Accepted on: 11 May 2005.
___________________Frontiers in Mechanical Engineering-Switzerland
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Submitted on: 01 March 2013.
Revised on: 15 June 2013.
Accepted on: 04 August 2013.
___________________Frontiers in Mechanical Engineering-Switzerland
Submitted on: 25 February 2000.
Revised on: 05 April 2000.
Accepted on: 08 May 2000.
___________________Frontiers in Mechanical Engineering-Switzerland
Submitted on: 04 January 1999.
Revised on: 16 February 1999.
Accepted on: 10 April 1999.
___________________Frontiers in Mechanical Engineering-Switzerland
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