Autori:
1. Kire Popovski, Univerzitetot “Sv. Kliment Ohridski” - Bitola, Macedonia
2. Stojance Nusev, Faculty of Technical Sciences in Bitola, University St. Climent Ohridski, Macedonia
3. Igor Andreevski, Univerzitetot “Sv. Kliment Ohridski” - Bitola, Macedonia