Yaisawarng S and JD Klein (1994). “The Effects of Sulfur-Dioxide Controls on Productivity Change in the United-States Electric-Power Industry.” Review of Economics and Statistics 7: 447-460.

Yaisawarng S and JD Klein (1994). “The Effects of Sulfur-Dioxide Controls on Productivity Change in the United-States Electric-Power Industry.” Review of Economics and Statistics 7: 447-460.

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