1. Nonparametric inference in connection with multiple decrement models;Aalen;Scand. J. Statist.,1976
2. An empirical transition matrix for nonhomogeneous Markov chains based on censored observations;Aalen;Scand. J. Statist.,1978
3. Andersen, P.K., Borgan, Ø., Gill, R.D., Keiding, N., 1993. Statistical Models Based on Counting Processes. Springer, New York.
4. Datta, S., Satten, G.A., Datta, S., 1998. Nonparametric estimation for the three stage irreversible illness-death model, Tech. Report STA98-18, Dept. of Statistics, Univ. of Georgia, Athens, GA 30602, USA.
5. Kalbfleisch, J.D., Prentice, R.L., 1980. The Statistical Analysis of Failure Time Data. Wiley, New York.