1. School of Transportation and Logistics, Central South University of Forestry and Technology, Changsha 410018, China
2. Business School, Hunan Normal University, Changsha 410081, China
3. School of Business Administration, Hunan University, Changsha 410082, China
4. School of Mathematical and Informational Sciences, Yantai University, Yantai 264005, Shandong, China
5. School of Mathematical Sciences, Qufu Normal University, Qufu 273165, Shandong, China
6. Department of Mathematics, Shandong University of Science and Technology, Qingdao 266590, Shandong, China