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2. An empirical transition matrix for non-homogeneous Markov chains based on censored observations;Aalen;Scand. J. Statist.,1978
3. Bootstrapping the Kaplan-Meier estimator;Akritas;J. Amer. Statist. Ass.,1986
4. Theory for the measurement of competing risks in animal experiments;Altshuler;Math. Biosci.,1970