Grosskopf S, K Hayes and S Yaisawarng (1992). “Measuring Economies of Diversification – a Frontier Approach.” J Business and Economic Statistics 1: 453-459.

Grosskopf S, K Hayes and S Yaisawarng (1992). “Measuring Economies of Diversification – a Frontier Approach.” J Business and Economic Statistics 1: 453-459.

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