Submitted on: 14 August 2006.
Revised on: 07 September 2006.
Accepted on: 21 September 2006.
LASER PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 27 January 1999.
Revised on: 09 March 1999.
Accepted on: 05 April 1999.
LASER PHYSICS LETTERS
Submitted on: 03 March 2007.
Revised on: 17 March 2007.
Accepted on: 05 April 2007.
LASER PHYSICS LETTERS---IOP PUBLISHING LTD
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Submitted on: 10 January 2002.
Revised on: 20 January 2002.
Accepted on: 04 February 2002.
LASER PHYSICS LETTERS---IOP PUBLISHING LTD
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