Pour une récapitulation des limites des différentes études, voir Congrès des Etats-Unis, Office of Technology Assessment (OTA), Trade and Environment, Conflicts and Opportunities, Appendix E, (OTA/BP/ITE/94) (Washington, D.C.: U.S. Government Printing Office, mai 1992).
Общий анализ недостатков различных исследований см. Congress of the United States, Office of Technology Assessment (OTA), Trade and Environment, Conflicts and Opportunities, Appendix E (OTA/BP/ITE/94) (Washington, D.C.: U.S. Government Printing Office, May 1992).