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.