@misc{indiciae84cbc5410435,
  title = {Estimation of multivariate frailty models using penalized partial likelihood.},
  author = {S Ripatti and J Palmgren},
  year = {2000},
  doi = {10.1111/j.0006-341x.2000.01016.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11129456/},
  note = {Source identifier: 11129456}
}