F?re R, S Grosskopf, S Yaisawarng, SK Li and ZP Wang (1990). “Productivity Growth in Illinois Electric Utilities. Resources and Energy.” Resources and Energy 1: 383-398.

F?re R, S Grosskopf, S Yaisawarng, SK Li and ZP Wang (1990). “Productivity Growth in Illinois Electric Utilities. Resources and Energy.” Resources and Energy 1: 383-398.

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