1. Department of Mathematics, Faculty of Science and Information Technology, Jadara University, Irbid, Jordan
2. Department of Mathematics and Computer Science, University of Larbi Ben M’hidi, Oum El Bouaghi, Algeria
3. Department of Mathematics, Faculty of Science, Zarqa University, Zarqa, Jordan
4. Department of Mathematics and Computer Science, University of Oum EL-Bouaghi, Oum El Bouaghi, Algeria