1. Nonparametric estimation from incomplete observations;Kaplan;J Am Stat Assoc,1958
2. Modelling survival data in medical research, section 2.1;Collett,1994
3. Practical statistics for medical research, chapter 13;Altman,1991
4. Review of survival analyses published in cancer journals;Altman;Br J Cancer,1995
5. Trial Participants. Coronary angioplasty versus medical therapy for angina: the second Randomised Intervention Treatment of Angina (RITA-2) trial;Lancet,1975