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• Current address : Didem K. Camcı: Çanakkale Onsekiz Mart University Dept. Math. Çanakkale TURKEY E-mail address : didemk@comu.edu.tr Current address : Ne¸set Aydın: Çanakkale Onsekiz Mart University Dept. Math. Çanakkale - TURKEY E-mail address : neseta@comu.edu.tr