1. Seasonal unit roots in aggregate U.S. data;Beaulieu,1991
2. An econometric analysis of the U.S. postwar G.N.P.;Bhargava;Journal of Population Economics,1990
3. Testing for seasonal unit roots in monthly data;Franses,1990
4. Seasonality, non-stationarity and the forecasting of monthly time series;Franses;International Journal of Forecasting,1991
5. Unit-root tests and the statistical pitfalls of seasonal adjustment: The case of U.S. postwar real gross national product;Ghysels;Journal of Business & Econometric Statistics,1990