@misc{indiciaeadd47039d7f4,
  title = {Using the EM-algorithm for survival data with incomplete categorical covariates.},
  author = {S R Lipsitz and J G Ibrahim},
  year = {1996},
  doi = {10.1007/bf00128467},
  url = {https://pubmed.ncbi.nlm.nih.gov/9384645/},
  note = {Source identifier: 9384645}
}