1. The Producer Services and Economic Development in the United States: the Last Decade;Beyers;Final Report prepared for the U.S. Department of Commercial, Economic Development Administration Technical Assistance and Research Division, Seattle, W,1989
2. Major control point in American economic geography;Borchert;Ann. Ass. Am. Geogr.,1978
3. The European Challenge 1992: the Benefits of a Single Market;Cecchini,1988
4. The changing transactions economy and its spatial implications;Cohen;Ekistics,1979
5. Business Services in the European Community: Situation and Role;Commission Of The European Communities,1990