1. Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova St., Lviv, 79060, Ukraine
2. Lviv Polytechnic National University, 12 Bandera St., Lviv, 79013, Ukraine
3. Lviv Polytechnic National University, 12 Bandera St., Lviv, 79013, Ukraine; The John Paul II Catholic University of Lublin, Racławickie 14 Ave., 20-950 Lublin, Poland