Affiliation: | 1. Faculty of Mechanical Engineering, Kraljice Marije 16, 11 000 Belgrade, Serbia;2. Department of Mathematics, COMSATS Institute of Information Technology, Islamabad, Pakistan;3. Faculty of Electrical Engineering, Bul. Kralja Aleksandra 73, 11 000 Belgrade, Serbia;4. Department of Applied Mathematics, Changwon National University, Changwon 641-773, Republic of Korea |