Yang Y, C Ma and D Zhang (1994). “Data Envelopment. Analysis and its Application in the Benefit Analysis of Milk Cow Production.” Transactions of the Chinese Society of Agricultural Engineering 10(1): 16.

Yang Y, C Ma and D Zhang (1994). “Data Envelopment. Analysis and its Application in the Benefit Analysis of Milk Cow Production.” Transactions of the Chinese Society of Agricultural Engineering 10(1): 16.

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