R. Cao, I. Lopez-de Ullibarri, P. Janssen, and N. Veraverbeke. Presmoothed kaplan-meier and nelsonaalen
estimators. Journal of Nonparametric Statistics, 17:31-56, 2005.
G. Dikta. On semiparametric random censorship models. Journal of Statistical Planning and Inference,
66:253-279, 1998.
E. Kaplan and P. Meier. Nonparametric estimation from incomplete observations. Journal of the
American Statistical Association, 53:457-481, 1958.