@misc{indiciaebaa45a5f59fc,
  title = {Frailty models for survival data.},
  author = {P Hougaard},
  year = {1995},
  doi = {10.1007/bf00985760},
  url = {https://pubmed.ncbi.nlm.nih.gov/9385105/},
  note = {Source identifier: 9385105}
}