9Callen,J,Chan,M.L,Kwan,C.C.Y. Spot and Forward Exchange Rates:A Causality Analysis[J].Journal of Business Finanee and Accounting,1989,(01):105-118.
10Chu Q C,Hsieh W G,Tse Y. Price Discovery on the S&P 500 Index Markets:Analysis of Spot Index,Index Futures and SPDRs[J].International Review of Financial Analysis,1999,(01):21-34.