@misc{indiciae2b4e63a35e2c,
  title = {Measurement or estimation.},
  author = {J F Coster and P W Helleman},
  year = {1966},
  doi = {10.1159/000384489},
  url = {https://pubmed.ncbi.nlm.nih.gov/5966390/},
  note = {Source identifier: 5966390}
}