About this article
Published Online: Oct 31, 2020
Page range: 73 - 83
Received: Jul 13, 2020
Accepted: Aug 21, 2020
DOI: https://doi.org/10.21307/acee-2020-025
Keywords
© 2020 Natalia Generowicz published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
GENEROWICZ, Natalia
Mineral and Energy Economy Research Institute of the PASKraków, Poland