Kavokin, Alexey V.
Sheremet, Alexandra S.
Shelykh, Ivan A.
Lagoudakis, Pavlos G.
Rubo, Yuri G.
Article History
Received: 25 March 2015
Accepted: 11 June 2015
First Online: 8 July 2015
Competing interests
: The authors declare no competing financial interests.