Author(s):
1. Savka Janković, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Dragana Gajić, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Philipp Sclender, University of Dresden, Faculty of Chemistry and Food Chemistry, Germany
4. Dijana Jelić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina