Submitted on: 02 May 2000.
Revised on: 21 May 2000.
Accepted on: 14 June 2000.
LASER PHYSICS LETTERS---IOP PUBLISHING LTD
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Submitted on: 24 May 2014.
Revised on: 09 June 2014.
Accepted on: 14 June 2014.
LASER PHYSICS LETTERS
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Submitted on: 09 November 2006.
Revised on: 21 November 2006.
Accepted on: 27 November 2006.
LASER PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 19 February 2016.
Revised on: 27 March 2016.
Accepted on: 18 April 2016.
LASER PHYSICS LETTERS---IOP PUBLISHING LTD