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Unit Root Tests ARMA Models with Data Dependent Methods for the Selection of the Truncation Lag.
Ng, S., (1994)
Useful Modifications to Some Unit Root Tests with Dependent Errors and Their Local Asymptotic Properties.
Perron, P., (1994)
Estimation and Inference in Nearly Unbalanced, Nearly Cointegrated Systems.
Ng, S., (1995)