@misc{1177586,
  author = {Lawrence I Knab},
  title = {A procedure for tristimulus color measurements on building stone:},
  year = {1984},
  month = {1984-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.84-2961},
  language = {en},
}