An empirical analysis of total-factor productivity in 30 sub-sub-sectors of China's nonferrous metal industry

2016 ◽  
Vol 50 ◽  
pp. 264-269 ◽  
Author(s):  
Liuguo Shao ◽  
Yingying He ◽  
Chao Feng ◽  
Shijing Zhang
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