Hall, W. J. and Wellner, J. A. (1980), “Confidence Bands for a Survival Curve from Censored Data,” Biometrika, 67, 133–143.

Kaplan, E. L. and Meier, P. (1958), “Nonparametric Estimation from Incomplete Observations,” Journal of the American Statistical Association, 53, 457–481.

Klein, J. P. and Moeschberger, M. L. (1997), Survival Analysis: Techniques for Censored and Truncated Data, New York: Springer-Verlag.