Dr. Wei-Kai Lai, Associate Professor of Mathematics, University of South Carolina Salkehatchie, USA
E-mail: LaiW@mailbox.sc.edu

Dr. N.Deniz Turgay, Department of Mathematics, Faculty of Arts and Sciences, Eastern Mediterranean University, Gazimagusa, Mersin 10, Turkey
E-mail: deniz_turgay@yahoo.com, neset.turgay@emu.edu.tr