1. Faculty of Mathematics, University of Belgrade, Jagićeva 5, 11000 Belgrade, Serbia
2. Faculty of Transport and Traffic, University of Belgrade, Vojvode Stepe 305, 11000 Beograd, Serbia
3. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11000 Beograd, Serbia
4. Department of Mechanical and Materials Engineering, Florida International University, 10555 W. Flagler St., Miami, FL, USA