Authors
Piotr Dywel
Institute of Mathematics and Physics, UTP University of Science and Technology, Bydgoszcz, Poland
Łukasz Skowroński
Institute of Mathematics and Physics, UTP University of Science and Technology, Bydgoszcz, Poland
© 2020 Piotr Dywel, Łukasz Skowroński, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.