1.
Title: Structural change and energy efficiency in industry
Author: Jenne, C. A.; Cattell, R. K.
Source: 1983, 5(2): 114-123
http://www.sciencedirect.com/science/article/B6V7G-458XJWV-7M/2/abca2cc5577a4509e87413dbc88c84e5  
2.
Title: Energy efficiency and the slump in labour productivity in the USA
Author: Renshaw, E. F.
Source: 1981, 3(1): 36-42
http://www.sciencedirect.com/science/article/B6V7G-458XJ47-5/2/d306e08eb3da86c52bcd49ced72ab641

完成！多谢！~