K. V. Sholiak https://orcid.org/0000-0001-8162-9879 Ivan Franko National University of Lviv Ukraine
T. B. Peretyatko https://orcid.org/0000-0002-5769-3050 Ivan Franko National University of Lviv Ukraine
N. S. Verkholyak https://orcid.org/0000-0001-7548-3842 Ivan Franko National University of Lviv Ukraine
S. P. Gudz Ivan Franko National University of Lviv Ukraine