Authors
Marie Macková
University of Social and Administrative Affairs, V. Nezvala 1, 736 01, Havírov, Czech Republic
Igor Kotlán
University of Social and Administrative Affairs, V. Nezvala 1, 736 01, Havírov, Czech Republic
© 2018 Marie Macková, Igor Kotlán, published by European Research University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.