Author(s):
1. Slađana Krstić, Mining and Metallurgy Institute Bor, Serbia
2. Milenko Ljubojev, Mining and Metallurgy Institute Bor, Serbia
3. Dušan Tašić, Mining and Metallurgy Institute Bor, Serbia
4. Ivana Jovanović, Mining and Metallurgy Institute Bor, Serbia
5. Jasmina Nešković, Mining institute, Belgrade, Serbia, Serbia
6. Sanja Petrović, Mining and Metallurgy Institute Bor, Serbia

Abstract