Authors
Alicja Krzeszowiec
Department of Mathematics, Technical University of Łódź, Łódź, Poland
Wojciech Wojdowski
Department of Mathematics, Technical University of Łódź, Łódź, Poland
© 2017 Alicja Krzeszowiec, Wojciech Wojdowski, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.