6Evans M,Lyons R.Order Flow and Exchange Rate Dynamies[J].Journal of Political Econo- my,2002,110( 1 ).
7Elliott W.B, Huffman S.P, Makar S.D. Foreign denominated debt and foreign curre ncy derivatives: Complements or substitutes in hedging foreign currency risk[J].Joumal of Mul- tinational Financial Managnment,2003,13(2).
8Allayannis G, Ofek E.Exehange rate exposure,hedging,and the use of foreign currency derivatives [J].Journal of intemational money and finance,2001,20(2).