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First Author:
 
Qiang Wang
College of Economics and Management, Nanjing University of Aeronautics and Astronautics, China.
njwqluck@live.cn
 
 
 
 

Second Author:

Yuanyuan He
College of Economics and Management, Nanjing University of Aeronautics and Astronautics, China.
heyyluck1981@hotmail.com
 
 
 
 

Third Author:

Qi Chen
College of Economics and Management, Nanjing University of Aeronautics and Astronautics, China.
chenqi_357@163.com