1. Chambers, J.M., Hastie, T.J., 1993. Statistical Models in S. Chapman & Hall, London.
2. Continuous Mortality Investigation Bureau, 1990. Continuous Mortality Investigation Reports CMIR 10. The Institute of Actuaries and the Faculty of Actuaries, UK.
3. Continuous Mortality Investigation Bureau, 1999. Continuous Mortality Investigation Reports CMIR 17. The Institute of Actuaries and the Faculty of Actuaries, UK.
4. Forfar, D.O., McCutcheon, M.A., Wilkie, A.D., 1988. On graduation by mathematical formula. Journal of the Institute of Actuaries 115, 1 and Transactions of the Faculty of Actuaries 41, 97.
5. Modelling and forecasting US mortality;Lee;Journal of American Statistical Association,1992