@misc{indiciae1478c5984e36,
  title = {Selecting concomitant variables using a likelihood ratio step-down procedure and a method of testing goodness of fit in an exponential survival model.},
  author = {R A Greenberg and S Bayard},
  year = {1974},
  url = {https://pubmed.ncbi.nlm.nih.gov/4429758/},
  note = {Source identifier: 4429758}
}