1. Department of Mathematics, University of Jeddah, College of Science and Arts at Khulis, Jeddah, Saudi Arabia
2. Department of Mathematics, Faculty of Science, Ain Shams University, Cairo, Abbassia, Egypt
3. Department of Mathematics, Academy of Engineering and Medical Sciences, Khartoum, Sudan
4. Department of Mathematics, Tripura University, Agartala, Tripura, 799022, India