LIU Jian
School of Economics and Management,Nanjing University of Science and Technology,Nanjing 210094,China;College of Information Science and Technology,The Pennsylvania State University,University Park,State College 10082,USACHEN Jian
School of Economics and Management,Tsinghua University,Beijing 100084,ChinaLIU Si-feng
School of Economics and Management,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,ChinaZHOU Xian-zhong
School of Management and Engineering,Nanjing University,Nanjing 210093,China