O. M. Moroz https://orcid.org/0000-0002-2351-5301 Ivan Franko National University of Lviv Ukraine
G. V. Yavorska https://orcid.org/0000-0002-0641-0794 Ivan Franko National University of Lviv Ukraine
N. O. Muravel Ivan Franko National University of Lviv Ukraine
I. R. Klym Ivan Franko National University of Lviv Ukraine