Kamshilin, Alexei A.
Nippolainen, Ervin
Sidorov, Igor S.
Vasilev, Petr V.
Erofeev, Nikolai P.
Podolian, Natalia P.
Romashko, Roman V.
Article History
Received: 5 January 2015
Accepted: 16 April 2015
First Online: 21 May 2015
Competing interests
: The authors declare no competing financial interests.