1. Department of Mathematics, College of Education, University of Sulaimani, Sulaimani, Kurdistan Region, Iraq
2. Department of Mathematical Sciences, Faculty of Sciences, Princess Nourah Bint Abdulrahman University, P.O.Box 84428, Riyadh 11671, Saudi Arabia
3. Department of Mathematics and Statistics, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia
4. Department of Mathematics, Faculty of Technical Science, University Ismail Qemali, Vlora, Albania