N Konopsky, Valery
V Alieva, Elena
Yu Alyatkin, Sergey
A Melnikov, Alexey
V Chekalin, Sergey
M Agranovich, Vladimir
Article History
Received: 30 December 2015
Revised: 18 May 2016
Accepted: 22 May 2016
First Online: 27 May 2016
Competing interests
: The authors declare no conflict of interest.