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Submitted on: 24 January 2003.
Revised on: 02 March 2003.
Accepted on: 21 March 2003.
___________________Frontiers in Mechanical Engineering-Switzerland
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Submitted on: 04 June 2018.
Revised on: 29 June 2018.
Accepted on: 06 August 2018.
___________________Frontiers in Mechanical Engineering-Switzerland
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Submitted on: 11 October 2004.
Revised on: 05 February 2005.
Accepted on: 28 March 2005.
___________________Frontiers in Mechanical Engineering-Switzerland
Submitted on: 13 August 1999.
Revised on: 10 November 1999.
Accepted on: 24 November 1999.
___________________Frontiers in Mechanical Engineering-Switzerland