Baskakov, Anatoly G.
Krishtal, Ilya A.
Funding for this research was provided by:
Division of Mathematical Sciences (DMS-1322127)
Ministry of Education and Science of the Russian Federation (1.3464.2017/4.6)
Article History
Received: 11 June 2017
Revised: 13 July 2017
Accepted: 24 July 2017
First Online: 2 August 2017