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- [7] MARKET-STRUCTURE, FIRM CHARACTERISTICS AND INNOVATIVE ACTIVITY JOURNAL OF INDUSTRIAL ECONOMICS, 1989, 37 (03): : 329 - 336
- [8] MARKET-STRUCTURE, FIRM STRUCTURE, AND RESEARCH-AND-DEVELOPMENT QUARTERLY REVIEW OF ECONOMICS AND BUSINESS, 1986, 26 (01): : 31 - 44
- [9] THE HERFINDAHL FIRM CONCENTRATION INDEX FOR AN ANALYSIS OF MARKET-STRUCTURE TRIMESTRE ECONOMICO, 1994, 61 (243): : 499 - 524