1. Kalbfleisch JD, Prentice RL. The Statistical Analysis of Failure Time Data. New York: Wiley, 1980.
2. Cox DR. Regression models and life tables. J R Stat Soc. 1972;34:187–220.
3. Miller R. Survival Analysis. New York: Wiley, 1981.
4. Lawless J. Statistical Models and Methods for Lifetime Data. New York: Wiley, 1982.
5. Cox D, Oakes D. Analysis of Survival Data. London: Chapman and Hall, 1984.