1. School of Mathematics, Thapar Institute of Engineering & Technology, Patiala-147004, Punjab, India
2. Teacher Education Faculty, University in Priština-Kosovska Mitrovica, Nemanjina bb, 38218, Leposavić, Serbia
3. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120, Beograd 35, Serbia