1. School of Foreign Studies, Anhui Sanlian University, Hefei, China;
2. School of Economics and Management, Tongji University, Shanghai, China;
3. Division of Computational Mathematics and Engineering, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;
4. Faculty of Finance and Banking, Ton Duc Thang University, Ho Chi Minh City, Vietnam