Yaisawarng S and JD Klein (1994). “The Effects of Sulfur Dioxide Controls on Productivity Change in the U.S. Electric Power Industry.” Review of Economics and Statistics 76(3): 447-460.

Yaisawarng S and JD Klein (1994). “The Effects of Sulfur Dioxide Controls on Productivity Change in the U.S. Electric Power Industry.” Review of Economics and Statistics 76(3): 447-460.

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