Аутори:
1. Jelena Penavin-Škundrić, Природно-математички факултет Бања Лука,
Republic of Srpska, Bosnia and Herzegovina
2. Zora Levi,
Republic of Srpska, Bosnia and Herzegovina
3. Slavica Sladojević,
Republic of Srpska, Bosnia and Herzegovina
4. Rada Petrovic,
Republic of Srpska, Bosnia and Herzegovina
5. Дарко Бодрожа,
Republic of Srpska, Bosnia and Herzegovina