Submitted on: 23 November 2023.
Revised on: 26 December 2023.
Accepted on: 01 January 2024.
St Petersburg Polytechnic University Journal-Physics and Mathematics
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Submitted on: 23 May 2003.
Revised on: 27 June 2003.
Accepted on: 14 July 2003.
St Petersburg Polytechnic University Journal-Physics and Mathematics
Submitted on: 29 December 2018.
Revised on: 01 February 2019.
Accepted on: 16 February 2019.
St Petersburg Polytechnic University Journal-Physics and Mathematics