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Submitted on: 14 October 2000.
Revised on: 16 November 2000.
Accepted on: 03 December 2000.
Journal of Zhejiang University-SCIENCE B
Submitted on: 18 November 2003.
Revised on: 25 December 2003.
Accepted on: 31 December 2003.
Journal of Zhejiang University-SCIENCE B
Submitted on: 20 April 2002.
Revised on: 30 April 2002.
Accepted on: 08 May 2002.
Journal of Zhejiang University-SCIENCE B
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Submitted on: 09 June 2001.
Revised on: 30 June 2001.
Accepted on: 25 July 2001.
Journal of Zhejiang University-SCIENCE B
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Submitted on: 12 August 2018.
Revised on: 11 September 2018.
Accepted on: 19 September 2018.
Journal of Zhejiang University-SCIENCE B