@misc{1196906,
  author = {Thomas R O'Brian and Albert C Parr and Edward A Early},
  title = {Standard Reference Materials:Film step tablet standards of diffuse visual transmission density - SRM 1001 and SRM 1008},
  year = {1998},
  month = {1998-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.260-135},
  language = {en},
}