Semi-parametric Seasonal Unit Root Tests
Tomás Barrio Castro, Paulo M. M. Rodrigues, A M Robert Taylor
Econometric Theory, vol. 34, 2018, p. 447-476.

On the Behaviour of Phillips-Perron Tests in the Presence of Persistent Cycles
Tomás Barrio Castro, Paulo M. M. Rodrigues, A M Robert Taylor
Oxford Bulletin of Economics and Statistics, vol. 77, 2015, p. 495-511.

The Impact of Persistent Cycles on Zero Frequency Unit Root Tests
Paulo M. M. Rodrigues, A M Robert Taylor, Tomás Barrio Castro
Econometric Theory, vol. 29, 2013, p. 1289-1313.