Submitted on: 23 December 2014.
Revised on: 18 February 2015.
Accepted on: 17 March 2015.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
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Submitted on: 28 April 2001.
Revised on: 21 June 2001.
Accepted on: 27 July 2001.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
Submitted on: 27 June 2010.
Revised on: 30 July 2010.
Accepted on: 24 August 2010.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
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Submitted on: 08 December 2012.
Revised on: 03 February 2013.
Accepted on: 18 March 2013.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
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