Submitted on: 20 March 2007.
Revised on: 27 June 2007.
Accepted on: 14 August 2007.
___________________Journal of Ocean University of China
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Submitted on: 24 January 2010.
Revised on: 05 March 2010.
Accepted on: 07 April 2010.
___________________Journal of Ocean University of China
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Submitted on: 04 November 2009.
Revised on: 02 December 2009.
Accepted on: 23 January 2010.
___________________Journal of Ocean University of China
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Submitted on: 08 February 2014.
Revised on: 05 June 2014.
Accepted on: 03 August 2014.
___________________Journal of Ocean University of China