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Author(s):
1. Milica Balaban, Prirodno-matematički fakultet Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
2. Rebeka Lorber, FTPO, Slovenia
3. Miroslav Huskić, FTPO, Slovenia
4. Vesna Antić, Univerzitet u Beogradu, Poljoprivredni fakultet, Serbia