Authors
Roman Fedoniuk
Polissia National University, Ukraine
Tetiana Klymenko
Polissia National University, Ukraine
Oleh Polishchuk
Polissia National University, Ukraine
Andrii Pitsil
Polissia National University, Ukraine
© 2021 Tetiana Fedoniuk, Roman Fedoniuk, Tetiana Klymenko, Oleh Polishchuk, Andrii Pitsil, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.