1. Akaike, H. (1973). Information theory and an extension of the maximum likelihood principle, 2nd International Symposium on Information Theory (eds. B. N.Petrov and F.Csáki), 267?281, Akadémiai Kiádo, Budapest.
2. Cox, D. R. (1959). The analysis of exponentially distributed life-times with two types of failure, J. Roy. Statist. Soc. Ser. B, 21, 411?421.
3. Ebrahimi, N. and Kirmani, S. N. U. A. (1995). A characterization of the proportional hazards model through a measure of discrimination between two residual life distribution, Biometrika (to appear).
4. Ebrahimi, N., Habibullah, M. and Soofi, E. S. (1992). Testing exponentiality based on Kullback-Leibler information, J. Roy. Statist. Soc. Ser. B, 54, 739?748.
5. Efron, B. (1981). Censored data and the bootstrap, J. Amer. Statist. Assoc., 76, 312?319.