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Submitted on: 30 August 2004.
Revised on: 12 September 2004.
Accepted on: 23 September 2004.
Science China-Physics Mechanics & Astronomy
Submitted on: 22 August 2009.
Revised on: 12 September 2009.
Accepted on: 27 September 2009.
Science China-Physics Mechanics & Astronomy
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