4GRANGER C W J. 1969. Investigating causal relations by econometric models and cross -spectral methods [ J ]. Economitrica, 37:424 -438.
5JOHANSEN S. 1988. Statistical analysis of cointegration vectors [ J ]. Journal of economic Dynamics and Control, 12:231 -254.
6JOHANSEN S, JUSELIUS K. 1990. Maximum likelihood estimation and inference on cointegration: with application to the demand for money[ J]. Oxford Bulletin of Economics and Statistic, 52 : 169 - 210.
