Affiliation: | a Department of Mathematics, Gazi University, Faculty of Sciences, Teknikokullar, 06500 Ankara, Turkeyb Department of Mathematics Education, Gazi University, Faculty of Education, Teknikokullar, 06500 Ankara, Turkeyc Department of Mathematics and Computer Sciences, Izmir University, Faculty of Arts and Sciences, 35350 Uckuyular, Izmir, Turkey |