By Førsund Finn R.   Hjalmarsson Lennart   in Journal of Productivity Analysis

ISSN:0895-562X|21|1|25-48

Springer Publishing Company ‎(2004)‎

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By Førsund Finn   Hjalmarsson Lennart   Zheng Jinghai   in Journal of Chinese Economics and Business Studies

ISSN:1476-5284|9|2|205-216

Routledge Ltd‎(2011)‎

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