A Note on Common Cycles, Common Trends, and Convergence
Vasco M. Carvalho, Andrew Harvey, Thomas Trimbur
Journal of Business and Economic Statistics, vol. 25, 2007, p. 12-20.

Convergence in the Trends and Cycles of Euro-Zone Income
Andrew Harvey, Vasco M. Carvalho
Journal of Applied Econometrics, vol. 20, 2005, p. 275-289.

Growth, Cycles and Convergence in US Regional Time Series
Vasco M. Carvalho, Andrew Harvey
International Journal Of Forecasting, vol. 21, 2005, p. 667-686.