Gordon, Joseph http://orcid.org/0000-0002-3530-4245
Panina, Gaiane http://orcid.org/0000-0001-7079-2590
Teplitskaya, Yana http://orcid.org/0000-0002-8006-9328
Funding for this research was provided by:
Russian Foundation for Basic Research (17-01-00128)
Program of the Presidium of the Russian Academy of Sciences N 01 ’Fundamental Mathematics and its Applications’ (PRAS-18-01)
Russian Science Foundation (14-21-00035)
Article History
Received: 1 December 2017
Accepted: 18 June 2018
First Online: 6 July 2018