1. Seasonal unit roots in aggregate U.S. data;Beaulieu,1990
2. Issues involved with the seasonal adjustment of economic time series;Bell;Journal of Business and Economic Statistics,1984
3. A note on seasonal models, seasonal adjustment, and nonseasonal unit roots;Bell,1990
4. Convergence of probability measures;Billingsley,1968
5. Limiting distributions of least squares estimates of unstable autoregressive processes;Chan;Annals of Statistics,1988