Authors
Dariusz Dudzik
Institute of Mathematics, Pedagogical University of Cracow, Podchorazych 2, 30-084, Kraków, Poland
Marcin Skrzynski
Institute of Mathematics, Cracow University of Technology, Warszawska 24, 31-155, Kraków, Poland
© 2017 Dariusz Dudzik, Marcin Skrzynski, published by University of Silesia in Katowice, Institute of Mathematics
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.