About this article
Published Online: Dec 18, 2019
Page range: 23 - 33
Received: May 30, 2019
Accepted: Nov 10, 2019
DOI: https://doi.org/10.2478/emj-2019-0030
Keywords
© 2019 Cezary Winkowski, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Winkowski, Cezary
Bialystok University of TechnologyBiałystok, Poland