Trakhinin, Yuri https://orcid.org/0000-0001-8827-2630
Wang, Tao https://orcid.org/0000-0003-4977-8465
Funding for this research was provided by:
Российский Фонд Фундаментальных Исследований (РФФИ) (19-01-00261-a)
National Natural Science Foundation of China (11971359)
National Natural Science Foundation of China (11731008)
Mathematical Center in Akademgorodok, under the agreement with the Ministry of Science and High Education of the Russian Federation (075-15-2019-1675)
Article History
Received: 26 December 2019
Accepted: 29 October 2020
First Online: 12 November 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.