@misc{indiciae370b553b6af6,
  title = {Letter: NSD calculations--a simple graphical method.},
  author = {D I Armstrong},
  year = {1974},
  doi = {10.1259/0007-1285-47-558-363},
  url = {https://pubmed.ncbi.nlm.nih.gov/4835215/},
  note = {Source identifier: 4835215}
}