Wei QL, H Yan and G Hao (2007). “Characteristics and Structures of Weak Efficient Surfaces of Production Possibility Sets.” J Mathematical Analysis and Applications 327(2): 1055-1074.

Wei QL, H Yan and G Hao (2007). “Characteristics and Structures of Weak Efficient Surfaces of Production Possibility Sets.” J Mathematical Analysis and Applications 327(2): 1055-1074.

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