1. Department of Mathematics and Computer Science, Faculty of Arts and Sciences, Cankaya University, 06530 Ankara, Turkey
2. Institute of Space Sciences, P.O. Box MG-23, 76900, Magurele, Bucharest, Romania
3. Department of Electrical Engineering, University of Bojnord, P.O. Box 94531-1339, Bojnord, Iran
4. Department of Physics, College of Arts and Sciences, Palestine Technical University, P.O. Box 7, Tulkarm, Palestine
5. Institute of Mathematics, Czestochowa University of Technology, al. Armii Krajowej 21, 42-201 Częstochowa, Poland