| Affiliation: | 1. School of Mathematics and Big Data, Foshan University, Guangdong, 528000, PR China;2. Department of Mathematics, College of Science, University of Baghdad, Baghdad, Iraq;3. Department of Mathematics and Informatics, University of Novi Sad, Trg Dositeja Obradovi?a 4, 21101 Novi Sad, Serbia;4. Centre for Research in Mathematics, School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;5. Department of Mathematics, University of York, Heslington, York YO10 5DD, UK |
