Authors
Piotr Kalisz
Central Mining Institute, Department of Surface and Structures Protection, Katowice, Poland
Magdalena Zięba
Central Mining Institute, Department of Surface and Structures Protection, Katowice, Poland
© 2018 Piotr Kalisz, Magdalena Zięba, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.