Authors
Wiktor Cwynar
University of Economics and Innovation, Lublin, Poland
Robert Pater
University of Information Technology and Management, Rzeszów, Poland
© 2017 Andrzej Cwynar, Wiktor Cwynar, Robert Pater, published by University of Maribor
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.