Email this article 
Copyright (c) 2014 Shponka I.S., Poslavskaya A.V., Yakovenko V.R.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 2014 Shponka I.S., Poslavskaya A.V., Yakovenko V.R.
This work is licensed under a Creative Commons Attribution 4.0 International License.