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Submitted on: 15 February 2000.
Revised on: 16 March 2000.
Accepted on: 31 March 2000.
Ocean Engineering---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 26 December 2001.
Revised on: 07 February 2002.
Accepted on: 14 February 2002.
Ocean Engineering---PERGAMON-ELSEVIER SCIENCE LTD
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