TY  - RPRT
TI  - Frailty modelling for the excess hazard.
AU  - P H Zahl
PY  - 1997
DO  - 10.1002/(sici)1097-0258(19970730)16:14<1573::aid-sim585>3.0.co;2-q
UR  - https://pubmed.ncbi.nlm.nih.gov/9257413/
ID  - 9257413
ER  -