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Submitted on: 19 January 1999.
Revised on: 19 February 1999.
Accepted on: 15 March 1999.
LASER PHYSICS
Submitted on: 25 February 2011.
Revised on: 08 March 2011.
Accepted on: 26 March 2011.
LASER PHYSICS---IOP PUBLISHING LTD
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Submitted on: 01 February 2020.
Revised on: 12 February 2020.
Accepted on: 06 March 2020.
LASER PHYSICS---IOP PUBLISHING LTD
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