1. Near Nehru Training Centre, H. No. 274, Nai Basti B-14, Bijnor, Uttar Pradesh 246701, India
2. Department of Natural Resources Engineering and Management, University of Kurdistan, Erbil, Iraq
3. Faculty of Mathematics, University of Belgrade, Studentski Trg 16, 11000 Belgrade, Serbia
4. Department of Mathematics, Aligarh Muslim University, Aligarh 202 002, India