Authors
grzegorz.maciejewski@ue.katowice.pl
University of Economics in Katowice, Department of Market and Consumption, Katowice, Poland
University of Economics in Katowice, Department of Market and Consumption, Katowice, Poland
grzegorz.maciejewski@ue.katowice.pl
© 2021 Grzegorz Maciejewski, Dawid Lesznik, published by ŁUKASIEWICZ RESEARCH NETWORK – INSTITUTE OF AVIATION
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.