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- [6] TECHNOLOGY FACTOR IN INTERNATIONAL TRADE - VERNON,R JOURNAL OF ECONOMIC HISTORY, 1971, 31 (03): : 723 - 724
- [7] TECHNOLOGY FACTOR IN INTERNATIONAL TRADE - FRENCH - VERNON,R REVUE ECONOMIQUE, 1972, 23 (01): : 128 - 129
- [8] TECHNOLOGY FACTOR IN INTERNATIONAL TRADE - CONFERENCE OF UNIVERSITIES-NATIONAL-BUREAU-COMMITTEE-FOR-ECONOMIC-RESEARCH - VERNON,R JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES A-GENERAL, 1971, 134 : 248 - 249