1] Dušan Golubović PRODUCTION REQUIRES AN APPRECIATION OF THE PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE MATERIAL FOR MACHINING" - Contemporary Materials 2021 - Savremeni materijali, 03.09.2021.
(https://ekonferencije.com/sr1/rad/production-requires-an-appreci/6024)

2] Dušan Golubović DETERMINATION OF WARNING PRODUCTS IN CONTACT OF TOOL STEEL AND IYOTHERMALLY IMPROVED NODULAR CAST" - Contemporary Materials 2021 - Savremeni materijali, 10.08.2021.
(https://ekonferencije.com/sr1/rad/determination-of-warning-produ/6014)