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Submitted on: 27 August 1998.
Revised on: 03 October 1998.
Accepted on: 10 November 1998.
___________________Chinese Optics Letters---CHINESE LASER PRESS
Submitted on: 13 June 2005.
Revised on: 21 September 2005.
Accepted on: 28 October 2005.
___________________Chinese Optics Letters---CHINESE LASER PRESS
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Submitted on: 16 December 2019.
Revised on: 27 February 2020.
Accepted on: 13 March 2020.
___________________Chinese Optics Letters---CHINESE LASER PRESS
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Submitted on: 27 November 2011.
Revised on: 18 December 2011.
Accepted on: 13 January 2012.
___________________Chinese Optics Letters---CHINESE LASER PRESS
Submitted on: 20 January 2013.
Revised on: 03 April 2013.
Accepted on: 16 April 2013.
___________________Chinese Optics Letters---CHINESE LASER PRESS
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