Institution: | Dr. G. Simić() is a professor and Dr. V. Lučanin () is a professor at the University of Belgrade–Faculty of Mechanical Engineering, Department of Railway Mechanical Engineering, Belgrade, Serbia.; . J. Tanasković() is in the "GOŠA Institute" d.o.o., Smederevska Palanka, Belgrade, Serbia.; . Dr. N. Radović() is a professor at the University of Belgrade–Faculty of Technology and Metallurgy, Department of Metallurgical Engineering, Belgrade, Serbia. |