@misc{indiciae66c1b39290ee,
  title = {A step-up procedure for selecting variables associated with survival.},
  author = {J M Krall and V A Uthoff and J B Harley},
  year = {1975},
  url = {https://pubmed.ncbi.nlm.nih.gov/1164538/},
  note = {Source identifier: 1164538}
}