Authors
Ryszard J. Pawlak
ryszard.pawlak@wmii.uni.lodz.pl
Faculty of Mathematics and Computer Science, University of Łódź, Łódź, POLAND
ryszard.pawlak@wmii.uni.lodz.pl
© 2022 Ryszard J. Pawlak, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.