Author(s):
1. Slađana Krstić, Mining and Metallurgy Institute Bor, Serbia
2. Milenko Ljubojev, Mining and Metallurgy Institute Bor, Serbia
3. Mile Bugarin, Mining and Metallurgy Institute Bor, Serbia
4. Ivana Jovanović, Mining and Metallurgy Institute Bor, Serbia
5. Jasmina Nešković, Mining institute, Belgrade, Serbia, Serbia
6. Miroslava Maksimović, Mining and Metallurgy Institute Bor, Serbia

Abstract