Wu W (1999). “Theorems on Optimal Value of DEA Model (C.C.G.S.S) and its Application in Simplification on Forecasting Method.” System Engineering Theory and Practice 19(9): 105-108.

Wu W (1999). “Theorems on Optimal Value of DEA Model (C.C.G.S.S) and its Application in Simplification on Forecasting Method.” System Engineering Theory and Practice 19(9): 105-108.

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