Author(s): |
Xinmin Zhang, School of Economics and Management Beijing Jiao tong University, bjtu, Beijing, China, 100044 Yihong Ru, School of Economics and Management Beijing Jiao tong University, bjtu, Beijing, China, 100044 Ruijiang Wang, School of Economics and Management Hebei University of science and Technology, Shijiazhuang, China, 050018 Yingkui Wang, School of Economics and Management Beijing Jiao tong University, bjtu, Beijing, China, 100044 |