都是什么啊？

Distribution of the estimators for autoregressive time series with a unit root

Likelihood ratio statistics for autoregressive time series with a unit root

by David A.Dickey; Wayne A.Fuller

Time series regression with a unit root by P.C.B.Phillips

Testing for a unit root in time series regression

by P.C.B.Phillips; Pierre Perrson

看看这里

https://bbs.pinggu.org/thread-19797-1-1.html