1. Department of Mathematics, Art and Science Faculty, Siirt University, TR-56100 Siirt, Turkey
2. Department of Mathematics and Statistics, The University of Lahore, Lahore, Pakistan
3. Department of Mathematics, National College of Business Administration and Economics, Lahore, Pakistan
4. Department of Mathematics, Faculty of Sciences, University of Central Punjab, Lahore, Pakistan
5. Department of Mathematics, Cankaya University, 06530 Balgat, Ankara, Turkey
6. Institute of Space Sciences, R76900 Magurele-Bucharest, Romania
7. Department of Medical Research, China Medical University, Taichung 40402, Taiwan