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- [6] THE STRUCTURE OF CANADIAN INTER-INDUSTRY R-AND-D SPILLOVERS, AND THE RATES OF RETURN TO R-AND-D JOURNAL OF INDUSTRIAL ECONOMICS, 1989, 37 (03): : 315 - 328
- [9] THE STATE OF R-AND-D IN THE PETROLEUM-INDUSTRY JOURNAL OF PETROLEUM TECHNOLOGY, 1995, 47 (07): : 586 - 588