Affiliation: | 1. Faculty of Mechanical Engineering, Kraljice Marije 16, 11 000 Belgrade, Serbia;2. Department of Mathematics, Lahore University of Management Sciences, Lahore - 54792, Pakistan;3. Department of Mathematics, Faculty of Agriculture, Nemanjina 6, 11 000 Belgrade, Serbia;4. Department of Mathematics, Science & Research Branch, Islamic Azad University, Post Code 14778, Ashrafi Esfahani Ave, Tehran, Islamic Republic of Iran |