@misc{indiciaef70b00e8435e,
  title = {SAS and SPLUS programs to perform Cox regression without convergence problems.},
  author = {Georg Heinze and Meinhard Ploner},
  year = {2002},
  doi = {10.1016/s0169-2607(01)00149-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/11853948/},
  note = {Source identifier: 11853948}
}