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Submitted on: 23 February 2003.
Revised on: 30 May 2003.
Accepted on: 15 June 2003.
___________________Cogent Engineering---TAYLOR & FRANCIS AS
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Submitted on: 18 May 2017.
Revised on: 15 September 2017.
Accepted on: 01 October 2017.
___________________Cogent Engineering---TAYLOR & FRANCIS AS