bayhan@mehmetakif.edu.tr
kanibir@hacettepe.edu.tr
i.reilly@auckland.ac.nz
© 2014 Sadik Bayhan, Alev Kanibir, Ivan L. Reilly, published by Slovak Academy of Sciences, Mathematical InstituteThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.