Firstov, Sergei V.
Alyshev, Sergey V.
Riumkin, Konstantin E.
Khopin, Vladimir F.
Guryanov, Alexey N.
Melkumov, Mikhail A.
Dianov, Evgeny M.
Article History
Received: 26 January 2016
Accepted: 13 June 2016
First Online: 30 June 2016
Competing interests
: The authors declare no competing financial interests.