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• Current address : Osman Avcıo¼glu: Usak University, Faculty of Arts and Sciences, Department of Mathematics, 64200 - Usak, Turkey.
• E-mail address : osman.avcioglu@usak.edu.tr Current address : ·Ibrahim ·Ilker Akça: Eskisehir Osmangazi University, Faculty of Science and Letters, Department of Mathematics and Computer Sciences, 26480 - Eskisehir, Turkey.
• E-mail address : iakca@ogu.edu.tr