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Submitted on: 29 October 2003.
Revised on: 07 December 2003.
Accepted on: 26 December 2003.
TSINGHUA SCIENCE AND TECHNOLOGY
Submitted on: 25 October 2005.
Revised on: 02 December 2005.
Accepted on: 30 December 2005.
TSINGHUA SCIENCE AND TECHNOLOGY
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Submitted on: 05 November 2010.
Revised on: 15 December 2010.
Accepted on: 11 January 2011.
TSINGHUA SCIENCE AND TECHNOLOGY