Author(s):
1. Đuro Koruga, Mašinski fakultet Univerziteta u Beogradu, Serbia
2. Branislava Jeftić, Univeristy of Belgrade, Faculty of Mechanical Engineering, 3. Jovana Šakota-Rosić, Mašinski fakultet Univerziteta u Beogradu, Serbia
4. Marija Tomić, Albania