@misc{835051,
  author = {Thomas O'Brian and Robert Saunders and Albert Parr and E Early},
  title = {Standard Reference Materials: Film Step Tablet Standards of Diffuse Visual Transmission Density--SRM 1001 and SRM 1008},
  year = {1998},
  month = {1998-07-01 00:07:00},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  language = {en},
}