Sokol, Alexander G.
Tomilenko, Anatoly A.
Bul’bak, Taras A.
Palyanova, Galina A.
Sokol, Ivan A.
Palyanov, Yury N.
Article History
Received: 9 January 2017
Accepted: 8 March 2017
First Online: 6 April 2017
Competing Interests
: The authors declare that they have no competing interests.