1. Science Faculty, Department of Mathematics, Firat University, 23119 Elazig, Turkey
2. Science Faculty, Department of Mathematics, Federal University Dutse, 7156 Jigawa, Nigeria
3. Department of Computer Engineering, Istanbul Gelisim University, Istanbul, Turkey
4. Department of Mathematics, Cankaya University, Ankara, Turkey
5. Institute of Space Sciences, Magurele, Romania