About this article
Published Online: Nov 25, 2018
Page range: 263 - 270
DOI: https://doi.org/10.2478/mgrsd-2002-0030
© 2002 Wiesław Ostrowski, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Wiesław Ostrowski