Author(s):
1. Saša Papuga, Faculty of Technology Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
2. Stana Kopranović, Republički zavod za statistiku Republike Srpske,
Republic of Srpska, Bosnia and Herzegovina
3. Ines Čizmić, Republički hidrometeorološki zavod Banja Luka ,
Republic of Srpska, Bosnia and Herzegovina