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[1] [3] Cox,D.R.(1972)"Regression models and life tabel". Journal of the Royal statistical Society,Series B 34:187 202.
[2] Tuma(1976) "Rewards,resources and the rate of mobility:a nonstationary multivariate stochastic model". American Sociological Review 41:338 360.
[4] Efron,B(1977)"The efficiency of Cox's likelihood function for censored data". Journal of the Amrican Statistical Association 72:557-565.
[5] Tuma,N.B.(1982)"Nonparametric and partially parametric approaches to event history analysis", PP.1 60 in S.Leinhardt (ed.) Sociology Methodology 1982.San Francisco:jossey-Bass.
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