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• Current address :Medine Ye¸silkayagil; Department of Mathematics, U¸sak University, 1 Eylül Campus, 64200–U¸sak, TURKEY , Feyzi Ba¸sar; Department of Mathematics, Fatih University, The Hadımköy Campus, Büyükçek- mece, 34500–·Istanbul, TURKEY
• E-mail address : medine.yesilkayagil@usak.edu.tr, fbasar@fatih.edu.tr. URL: http://communications.science.ankara.edu.tr/index.php?series=A1