@misc{indiciae0a14e7407b77,
  title = {Heterogeneity in survival analysis.},
  author = {O O Aalen},
  year = {1988},
  doi = {10.1002/sim.4780071105},
  url = {https://pubmed.ncbi.nlm.nih.gov/3201038/},
  note = {Source identifier: 3201038}
}