1. Department of Mathematics, Faculty of Science and Arts, Ordu University, Ordu, TURKEY
2. Department of Mathematics, Faculty of Science and Arts, Düzce University, Düzce, TURKEY
3. Department of Mathematics K. K. Education Faculty, Ataturk University, 25640, Kampus, Erzurum, TURKEY
4. Department of Mathematics, Faculty of Science and Arts, Kahramanmaraş Sütcü Imam University, Kahramanmaraş-TURKEY