1. Department of Mathematics, Swansea University, Swansea, UK
2. Department of Basic Sciences and Humanities, College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST) Islamabad Pakistan
3. Faculty of Mathematics and Statistics, Ton Duc Thang University, Ho Chi Minh City, Vietnam
4. Basic Engineering Sciences Department College of Engineering, Majmaah University, Majmaah, Saudi Arabia
5. Department of Mathematics, College of Science Majmaah University, Majmaah, Saudi Arabia