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Author(s):
1. Diana Bogdan, Rudarski institut Prijedor, e-mail Save Kovačevića bb, Prijedor,
Republic of Srpska, Bosnia and Herzegovina
2. Ljiljana Tankosic, Rudarski institut Prijedor, e-mail Save Kovačevića bb, Prijedor,
Republic of Srpska, Bosnia and Herzegovina
3. Duško Torbica, Rudarski fakultet Prijedor,
Republic of Srpska, Bosnia and Herzegovina
Abstract