1. Department of Mathematics, Selcuk University, Faculty of Science , Selcuklu , 42003, Konya , Turkey
2. Department of Mathematics, Bilecik Seyh Edebali University, Faculty of Science , Bilecik , Turkey
3. Department of Mathematics, Kirikkale University, Faculty of Science and Arts , Yahsihan , 71450, Kirikkale , Turkey
4. Department of Mathematics and Computer Science, University of Perugia , 1, Via Vanvitelli , 06123 Perugia , Italy