Haghighat MS and E Khorram (2005). “The Maximum and Minimum Number of Efficient Units in DEA with Interval Data.” Appl Math Comput 163(2): 919-930.

Haghighat MS and E Khorram (2005). “The Maximum and Minimum Number of Efficient Units in DEA with Interval Data.” Appl Math Comput 163(2): 919-930.

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