1. Berlinet, A. (1993). Hierarchies of higher order kernels. Probability Theory and Related Fields, 94, 489–504.
2. Berlinet, A., & Devroye, L. (1994). A comparison of kernel density estimates. Publications de l’Institut de Statistique de l’Université de Paris, 38, 3–59.
3. Box, G. E. P., & Jenkins, G. M. (1970). Time series analysis: Forecasting and control. San Francisco, CA, USA: Holden-Day (Second Edition 1976).
4. Castles, I. (1987). A guide to smoothing time series estimates of trend. Catalogue No. 1316. Australian Bureau.
5. Chhab, N., Morry, M., & Dagum, E. B. (1999). Results on alternative trend-cycle estimators for current economic analysis. Estadistica, 49–51, 231–257.