Published Online: Jun 12, 2018
Page range: 3 - 4
DOI: https://doi.org/10.2478/aopf-2018-0001
© 2018 Andrzej Kapusta, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Andrzej Kapusta
Arkadiusz Wołos