| Affiliation: | 1. School of International Trade and Economics, Central University of Finance and Economics, 39 South College Road, Haidian District, Beijing 100081, PR China;2. Department of International Economics & Trade, Nanjing University, 22 Hankou Road, Nanjing, 210093, PR China;1. University of Catania, Department of Political and Social Sciences, Via V. Emanuele 8, 95100 Catania, Italy;2. Polytechnic University of Marche, Department of Economics and Social Sciences, Piazzale Martelli 8, 60121 Ancona, Italy |
