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Submitted on: 30 May 2000.
Revised on: 06 July 2000.
Accepted on: 23 August 2000.
___________________JOURNAL OF RUSSIAN LASER RESEARCH
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Submitted on: 13 September 2010.
Revised on: 07 October 2010.
Accepted on: 03 November 2010.
___________________JOURNAL OF RUSSIAN LASER RESEARCH
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