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Copyright (c) 2017 V. G. Dan'ko, E. V. Goncharov, I. V. Poliakov
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
ISSN 2074–272X (Print)
ІSSN 2309–3404 (Online)
Copyright (c) 2017 V. G. Dan'ko, E. V. Goncharov, I. V. Poliakov