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• (Yavuz Selim Balkan) Duzce University, Faculty of Art and Sciences, Department of Mathematics, Duzce/TURKEY
• E-mail address: y.selimbalkan@gmail.com
• (Nesip Aktan) Duzce University, Faculty of Art and Sciences, Department of Math- ematics, Duzce/TURKEY
• E-mail address: nesipaktan@gmail.com