@misc{indiciae437098d2a223,
  title = {Frailty modelling for the excess hazard.},
  author = {P H Zahl},
  year = {1997},
  doi = {10.1002/(sici)1097-0258(19970730)16:14<1573::aid-sim585>3.0.co;2-q},
  url = {https://pubmed.ncbi.nlm.nih.gov/9257413/},
  note = {Source identifier: 9257413}
}