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Author(s):
1. Ljiljana Tankosic, Rudarski fakultet Prijedor,
Republic of Srpska, Bosnia and Herzegovina
2. Svjetlana Sredić, Rudarski institut Prijedor, e-mail Save Kovačevića bb, Prijedor,
Republic of Srpska, Bosnia and Herzegovina
3. N. Ćalić, Rudarski fakultet Prijedor,
Republic of Srpska, Bosnia and Herzegovina
4. M. Kostović, Rudarsko-geološki fakultet u Beogradu,
Republic of Srpska, Bosnia and Herzegovina