1. Non-parmetric estimation from incomplete observations;Kaplan;J Am Stat Assoc,1958
2. Prognostic factors—cervical carcinoma: multivariate approach;Haas;Balliere's Clin Obstet Gynecol,1986
3. Regression models and life tables;Cox;J R Stat Series B,1972
4. Statistical Models and Methods for Lifetime Data;Lawless,1982