[1] Natl Acad Sci Ukraine, Frantsevych Inst Problems Mat Sci, UA-03142 Kiev, Ukraine
[2] Czestochowa Tech Univ, Dept Elect Engn, PL-42217 Czestochowa, Poland
[3] J Dlugosz Univ Czestochowa, Inst Phys, Czestochowa, Poland
[4] Lviv Natl Univ Vet Med & Biotechnol, Dept Inorgan & Organ Chem, UA-79010 Lvov, Ukraine
[5] Eastern European Natl Univ, Dept Inorgan & Phys Chem, UA-43025 Lutsk, Ukraine
[6] Yuriy Fedkovych Chernivtsi Natl Univ, UA-58012 Chernovtsy, Ukraine
[7] Lesya Ukrainka Eastern European Natl Univ, Dept Solid State Phys, UA-43025 Lutsk, Ukraine