Narayan and Popp (2010) Two Structural Breaks Unit Root Test (Gauss)
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Narayan, P.K. and Popp, S. (2010) A New Unit Root Test with Two Structural Breaks in Level and Slope at Unknown time. Journal of Applied Statistics, 37, 1425-1438. http://dx.doi.org/10.1080/02664760903039883