Adele H. Marshall Barry Shaw Modeling the Survival of Hip Fracture Patients Using a Conditional Phase-Type Distribution. 518-523 2008 CBMS https://doi.org/10.1109/CBMS.2008.81 https://doi.ieeecomputersociety.org/10.1109/CBMS.2008.81 conf/cbms/2008 db/conf/cbms/cbms2008.html#MarshallS08