1. IT4Innovations, VSB–Technical University of Ostrava, Ostrava, Czech Republic
2. Department of Computer Science and Mathematics, Lebanese American University, Byblos, Lebanon
3. Department of Mathematics, Namal University, Talagang Road, Mianwali 42250, Pakistan
4. Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan