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Submitted on: 13 January 2014.
Revised on: 02 March 2014.
Accepted on: 30 March 2014.
___________________Journal of Contemporary Physics-Armenian Academy of Sciences
Submitted on: 29 October 2003.
Revised on: 21 December 2003.
Accepted on: 10 February 2004.
___________________Journal of Contemporary Physics-Armenian Academy of Sciences
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Submitted on: 20 May 1998.
Revised on: 23 July 1998.
Accepted on: 18 August 1998.
___________________Journal of Contemporary Physics-Armenian Academy of Sciences
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Submitted on: 22 July 2018.
Revised on: 29 October 2018.
Accepted on: 21 November 2018.
___________________Journal of Contemporary Physics-Armenian Academy of Sciences
Submitted on: 19 October 1999.
Revised on: 09 November 1999.
Accepted on: 25 November 1999.
___________________Journal of Contemporary Physics-Armenian Academy of Sciences