Affiliation: | a Department of Mathematics, Disha Institute of Management and Technology, Satya Vihar, Vidhansabha-Chandrakhuri Marg, Mandir Hasaud, Raipur 492101, Chhattisgarh, India b University of Belgrade, Faculty of Mathematics, Studentski trg 16, 11000 Beograd, Serbia c University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Beograd, Serbia |