Published Online: Mar 12, 2020
Page range: 97 - 101
DOI: https://doi.org/10.2478/icame-2020-0004
© 2020 Frederic Zähres, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Frederic Zähres
Bielefeld University,