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Zofio JL and CAK Lovell (2001). “Graph Efficiency and Productivity Measures: An Application to US Agriculture.” Appl Econ 33(11): 1433-1442.

Zofio JL and CAK Lovell (2001). “Graph Efficiency and Productivity Measures: An Application to US Agriculture.” Appl Econ 33(11): 1433-1442.

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