5Findley D F, Monsell B C, Bell W R, Otto M C, Chen B C. New Capabilities and Methods of the X-- 12 -- ARIMA Seasonal Adjustment Program[J] Journal of Business and Economics Statistics, 1998,16(2).
6Engle R F. Autoregressive Conditional Heteroskedasticity with Estimates of the Variance Of U. K. Inflation [J]. Econometrica, 1982,50 (4).
7Bollerslev T. Generalized Autoregressive Conditional Heteroskedasticity[J]. Journal of Econometrics, 1986,31(3).
8Engle R F, Lilien D M,Robins R P. Estimating Time Varying Risk Premia in the Term Structure: the ARCH--M Model [J]. Econometrica, 1987,55(2).
9Rabemananjara R, Zokoian J M. Threshold ARCH Models and Asymmetries in VolatiIity[J]. Journal of Applied Econometrics. 1993,8(1).
10Nelson D B. Conditional Heteroskedastieity in Asset Returns: a New Approach[J]. Eeonometrica, 1991,59(2).