1. Department of Applied Mathematics and Physics, Palestine Polytechnic University, Hebron, Palestine Department of Mathematics and Statistics, University of Konstanz, Konstanz, Germany
2. Department of Mathematics and Statistics, University of Regina, Regina, SK, S4S 0A2, Canada
3. Department of Mathematics and Computer Science, Brandon University, Brandon, MB R7A 6A9, Canada and School of Mathematical Sciences, Rochester Institute of Technology, Rochester, NY, 14623, USA.
4. Department of Mathematics and Statistics, University of Regina, Regina, SK, S4S 0A2, CanadaDepartment of Mathematics and Computer Science, Brandon University, Brandon, MB R7A 6A9, Canada
5. Department of Computer Science, University of Regina, Regina, SK, S4S 0A2, Canada