6Engle, Robert F. and C. W. J. Granger. Co - integration and Error Correction: Representation, Estimation, and Testing, Eeonometrica, 1987, 55 : 251 ~ 276.
5Engle, Robert F. and C. W. J. Granger. Co-integration and Error Correction: Representation, Estimation, and Testing, Econometrica, 1987, (55) :251 - 276.