Denisenko, D. S. http://orcid.org/0000-0003-1293-2633
Makarenko, N. I.
Funding for this research was provided by:
RFBR (18-01-00648)
Mathematical Center in Akademgorodok (075-15-2019-1613)
Article History
Received: 31 May 2020
Accepted: 6 August 2020
First Online: 20 August 2020