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Copyright (c) 2019 Boris Pospelov, Ruslan Meleshchenko, Vitalii Asotskyi, Olena Petukhova, Stella Gornostal, Serhii Harbuz

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This work is licensed under a Creative Commons Attribution 4.0 International License.

ISSN 2461-4262 (Online), ISSN 2461-4254 (Print)