About this article
Published Online: Dec 22, 2018
Page range: 5 - 10
DOI: https://doi.org/10.2478/mgrsd-1986-020102
Keywords
© 2018 Andrzej Richling, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Richling, Andrzej