@misc{indiciaece891a4a4ed1,
  title = {Rule for obtaining 75 per cent threshold with the staircase method.},
  author = {R Wales and R R Blake},
  year = {1970},
  doi = {10.1364/josa.60.0284\_1},
  url = {https://pubmed.ncbi.nlm.nih.gov/5416053/},
  note = {Source identifier: 5416053}
}