Authors
Danica Fazekašová
Department of Environmental Management, Faculty of Management, University of Prešov in Prešov, Prešov
Juraj Fazekaš
Department of Environmental Management, Faculty of Management, University of Prešov in Prešov, Prešov
© 2019 Danica Fazekašová, Juraj Fazekaš, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.