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Author(s):
1. Stana Ristanović, Alumina doo, ,
Republic of Srpska, Bosnia and Herzegovina
2. Dragica Lazić,
Republic of Srpska, Bosnia and Herzegovina
3. Dragana Kešelj,
Republic of Srpska, Bosnia and Herzegovina
4. Dragana Blagojević, Prirodno-matematički fakultet Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
5. Slavica Sladojević,
Republic of Srpska, Bosnia and Herzegovina
6. Gordana Ostojic,
Republic of Srpska, Bosnia and Herzegovina