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- [19] INNOVATION, MARKET-STRUCTURE, AND WELFARE - A STACKELBERG MODEL QUARTERLY REVIEW OF ECONOMICS AND BUSINESS, 1990, 30 (01): : 40 - 53
- [20] THE HERFINDAHL FIRM CONCENTRATION INDEX FOR AN ANALYSIS OF MARKET-STRUCTURE TRIMESTRE ECONOMICO, 1994, 61 (243): : 499 - 524