About this article
Published Online: Dec 22, 2018
Page range: 79 - 84
DOI: https://doi.org/10.2478/mgrsd-1986-020111
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© 2018 Krzysztof Olszewski, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Olszewski, Krzysztof