Affiliation: | 1. Department of Mathematics , Izmir University of Economics , Sakarya Caddesi 156, Izmir, 35330, Turkey;2. Dept. of Engineering Management and Systems Engineering, School of Engineering and Applied Science , George Washington University , 1776/G Street, N.W., Washington DC, 20052, USA;3. Dept. of Mathematics/084 , University of Nevada , Reno, NV, 89557-0045, USA |