Jamshid Etezadi-Amoli, Antonio Ciampi, Extended Hazard Regression for Censored Survival Data with Covariates: A Spline Approximation for the Baseline Hazard Function, Biometrics, Vol. 43, No. 1 (Mar., 1987), pp. 181-192
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Etezadi-Amoli et al. (1987) studied this question.
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