5Peltzman, S. (2000). Prices Rise Faster than They Fall, Journal of Political Economy, 108 (3) : 466 - 502.
6Kinnuean, H.W. and Forker, O. D. (1987). Asymmetry in Farm - Retail Price Transmission for Major Dairy Products, American Journal of Agricultural Economics, 69 : 285 - 292.
7Balke, N.S. and Fomby, T. B. (1997). Threahold Cointegration, International Economics Review, 38 ( 3 ) : 627 - 645.
8Goodwin, B.K. and Holt, M. T. (1999). Asymmetric Adjustment and Price Transmission in the U.S. Beef Sector, American Journal of Agricultural Economics, 81 : 630 -637.
9Goodwin, B. K. and Harper, D.C. (2000). Price Trans- mission, Threshold Behavior and Asymmetric Adjustment in the U. S. Pork Sector, Journal of Agricultural & Applied Economics, 32:543 - 553.
10Enders, W. and Granger, C. W. J. ( 1998 ). Unit - root Tests and Asymmetric Adjustment with an Example Using the Term Structure of Interest Rates, Journal of Business & Economic Statistics.
3Engle, R. F. Autoregressive conditional heteroscedasticity with estimates of the variance of United Kingdom inflation [ J ]. Econometrica: Journal of the Econometric Society, 1982, 50 (4) : 987 - 1007.
4Bollerslev, T. Generalized autoregressive conditional heteroskedasticity [ J]. Journal of Econometrics, 1986, 31 (3) : 307 - 327.
5Zakoian, J. M. Threshold heteroskedastic models [J]. Journal of Economic Dynamics and Control, 1994, 18 (5) : 931 - 955.
6Nelson, D. B. Conditional heteroskedasticity in asset returns: A new approach [ J ]. Econometrica: Journal of the Econometric Society, 1991, 59(2) : 347 -370.