Authors
Liudmyla Herasymchuk
Polissya National University, Zhytomyr, Ukraine
Andrii Pitsil
Polissya National University, Zhytomyr, Ukraine
Julia Palkevich
Private Higher Educational Establishment «European University», Kyiv, Ukraine
© 2022 Ruslana Valerko, Liudmyla Herasymchuk, Andrii Pitsil, Julia Palkevich, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.