Kordyukov, Yuri A. https://orcid.org/0000-0003-2957-2873
Funding for this research was provided by:
The Volga Region Mathematical Center (075-02-2020-1478)
Article History
Received: 16 January 2021
Revised: 27 November 2021
Accepted: 7 December 2021
First Online: 22 December 2021
Declarations
:
: The author declares that he has no conflict of interest.