1. Department of Mathematics, COMSATS University, Islamabad, Pakistan
2. School of Marine Science and Engineering, South China University of Technology, Guangzhou, China
3. College of Mathematics and Systems Science, Shandong University of Science & Technology, Qingdao, China
4. Material Science Innovation and Modelling (MaSIM) Research Focus Area, North-West University (Mafikeng Campus), Mmabatho, South Africa