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Submitted on: 10 March 1999.
Revised on: 12 April 1999.
Accepted on: 20 April 1999.
Journal of Zhejiang University-SCIENCE B
Submitted on: 01 August 1998.
Revised on: 23 August 1998.
Accepted on: 14 September 1998.
Journal of Zhejiang University-SCIENCE B
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Submitted on: 16 December 2010.
Revised on: 27 January 2011.
Accepted on: 05 February 2011.
Journal of Zhejiang University-SCIENCE B
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Submitted on: 12 March 2014.
Revised on: 15 April 2014.
Accepted on: 21 April 2014.
Journal of Zhejiang University-SCIENCE B
Submitted on: 11 April 1998.
Revised on: 21 April 1998.
Accepted on: 15 May 1998.
Journal of Zhejiang University-SCIENCE B
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