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Submitted on: 02 February 2010.
Revised on: 14 March 2010.
Accepted on: 18 April 2010.
___________________Chinese Optics Letters---CHINESE LASER PRESS
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Submitted on: 17 October 2004.
Revised on: 14 December 2004.
Accepted on: 06 February 2005.
___________________Chinese Optics Letters---CHINESE LASER PRESS
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Submitted on: 28 December 2017.
Revised on: 22 January 2018.
Accepted on: 12 February 2018.
___________________Chinese Optics Letters---CHINESE LASER PRESS
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