Streltsov, Sergey S.
Shorikov, Alexey O.
Skornyakov, Sergey L.
Poteryaev, Alexander I.
Khomskii, Daniel I.
Article History
Received: 21 June 2017
Accepted: 21 September 2017
First Online: 11 October 2017
Competing Interests
: The authors declare that they have no competing interests.