Submitted on: 10 December 2011.
Revised on: 05 January 2012.
Accepted on: 14 February 2012.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
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Submitted on: 23 October 2018.
Revised on: 24 December 2018.
Accepted on: 22 January 2019.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
Submitted on: 16 July 2022.
Revised on: 29 August 2022.
Accepted on: 10 October 2022.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
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Submitted on: 07 February 2019.
Revised on: 05 March 2019.
Accepted on: 16 April 2019.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER
Submitted on: 10 July 2014.
Revised on: 16 September 2014.
Accepted on: 24 October 2014.
___________________DOKLADY PHYSICS---MAIK NAUKA/INTERPERIODICA/SPRINGER