@misc{indiciae1bb15be3e1b3,
  title = {Constant-brightness surfaces generated by several color-difference formulas.},
  author = {E J Muth and C G Persels},
  year = {1971},
  doi = {10.1364/josa.61.001152},
  url = {https://pubmed.ncbi.nlm.nih.gov/5121884/},
  note = {Source identifier: 5121884}
}