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.