@misc{indiciaeaadf5ccfe95a,
  title = {Nested frailty models using maximum penalized likelihood estimation.},
  author = {V Rondeau and L Filleul and P Joly},
  year = {2006},
  doi = {10.1002/sim.2510},
  url = {https://pubmed.ncbi.nlm.nih.gov/16463308/},
  note = {Source identifier: 16463308}
}