Dyka, Bohdana, Ivan Franko National University of Lviv, 1, Universytetska str., Lviv, 79000, Ukraine
Dykan, Valeriia, V.N. Karazіn Kharkiv National University, 1, Mironositskaya Str., Kharkiv, 61002, Ukraine
Dziurakh, Yurii, Lviv Polytechnic National University, 12, Stepan Bandera Str., Lviv, 79013, Ukraine

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