Shakirov, Alexey M.
Tsibulsky, Sergey V.
Antipov, Andrey E.
Shchadilova, Yulia E.
Rubtsov, Alexey N.
Article History
Received: 28 September 2014
Accepted: 22 December 2014
First Online: 27 January 2015
Competing interests
: The authors declare no competing financial interests.