4G.C Hufbauer, K .A.Elliott. Measuring the Costs of Protection in the United States. Washington D.C: Institute for International Economics, January 1994.
5G.C Hufbauer. The Benefits of Open Markets and The Cost of Trade Protection and Economic Sanction,December 1997, www.acc f.org/welcome.htm.
6Romain Wacziarg. Measuring the Dynamic Gains from Trade,the World Bank Economic Review.2002. Vol.15.No.3.393-429.
7J.F.Francois, H.G.dean Spianger.the Cost of EU Trade Protection in Textile and Clothing November.2000 www.aacf .org/welcome.htm.
8Stern.M Robert. the US Tariff and the Efficiency of the U.S Ecopomy 1964 AER.54 No2.
9Magee Stephen. P. the Welfare Effects of Restriction on US Trade ,Brooking Papers in Economic Analysis.1972.
10Balssa·B, M.Kreinin. Trade Liberalization Under the Kennedy Round: the Static Effects, Review of Economics and Statistics 49 , No . 2.
