Authors
Iwona Polak
Institute of Computer Science, University of Silesia, Sosnowiec, Poland
Mariusz Boryczka
Institute of Computer Science, University of Silesia, Sosnowiec, Poland
© 2019 Iwona Polak, Mariusz Boryczka, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.