Volpert, V.
Funding for this research was provided by:
RUDN University Program 5-100 (RUDN University Program 5-100)
Russian Science Foundation (grant number 18-11-00171)
CNRS (project PRC2307)
Article History
Received: 21 July 2018
Revised: 25 March 2019
First Online: 17 April 2019