Autori:
1. Dragana Popara, Krajina Klas d.o.o. Banja Luka,
Republic of Srpska, Bosnia and Herzegovina
2. Milos Sorak, Tehnološki fakultet Univerziteta u Banjoj Luci,
Republic of Srpska, Bosnia and Herzegovina
3. Miroslav Dragić, University of Banja Luka, Faculty of Technology,
Republic of Srpska, Bosnia and Herzegovina