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• Current address : M. Yıldırım: Kırıkkale University, Faculty of Sciences and Arts, Department of Mathematics, 71450 Kırıkkale/ Turkey
• E-mail address : myildirim@kku.edu.tr Current address : K. ·Ilarslan: Kırıkkale University, Faculty of Sciences and Arts, Department of Mathematics, 71450 Kırıkkale/ Turkey
• E-mail address : kilarslan@kku.edu.tr