1.On the theory of testing for unit roots in observed time series,
Review of Economic Studies,
Volume 53, Issue 3,Pp. 369-384
2.Testing for a unit root in the presence of moving average errors,
Biometrika,
Volume 76, Issue 1,Pp. 49-56
3.
Peter C.B. Phillips,Sam Ouliaris,
Testing for a Unit Root in the Presence of a Maintained Trend
4.
R F Engle, C W J Granger ,Co-integration and error correction: Representation, estimation and testing (1987)