Helfand SM and ES Levine (2004). “Farm Size and the Determinants of Productive Efficiency in the Brazilian Center-West.” Agricultural Economics 31(2-3): 241-249.

Helfand SM and ES Levine (2004). “Farm Size and the Determinants of Productive Efficiency in the Brazilian Center-West.” Agricultural Economics 31(2-3): 241-249.

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