Amirteimoori A and S Kordrostami (2005). “Efficient Surfaces and an Efficiency Index in DEA: A Constant Returns to Scale.” Appl Math Comput 163(2): 683-691.

Amirteimoori A and S Kordrostami (2005). “Efficient Surfaces and an Efficiency Index in DEA: A Constant Returns to Scale.” Appl Math Comput 163(2): 683-691.

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