@misc{indiciaedc7e485b3e8b,
  title = {Simplified subtraction.},
  author = {J J Crittenden and C A Stern},
  year = {1966},
  doi = {10.2214/ajr.97.2.523},
  url = {https://pubmed.ncbi.nlm.nih.gov/5329337/},
  note = {Source identifier: 5329337}
}