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- [1] Impact of Exchange Rate Uncertainty on Trade Flows: Evidence from Commodity Trade between the United States and the United Kingdom[J] . MohsenBahmani‐Oskooee,MarinaKovyryalova.World Economy . 2008 (8)
- [2] 美国农业部对外农业服务局网 .2 http://mrldatabase.com/query.cfm .