Department of Mathematics, Faculty of Science, Uludag University, 16059 Bursa, Turkey
Received 31 January 2014; Accepted 9 March 2014; Published 20 March 2014
Academic Editors: E. Bannai, F. Rosselló, and S. Zhou
Copyright © 2014 Ahmet Tekcan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.