Affiliation: | 1.Institute of Metal Science, Equipment, and Technologies “Acad. A. Balevski” with Center for Hydro- and Aerodynamics, Bulgarian Academy of Sciences,Sofia,Bulgaria;2.Institute of General and Inorganic Chemistry,Bulgarian Academy of Sciences,Sofia,Bulgaria;3.Deaprtment of Chemistry and Biochemistry,Medical University – Pleven,Pleven,Bulgaria |